Add debug tracing for CURL_CHECK_DEF

Skip data type check in DO_CURL_OFF_T_CHECK macro when argument is empty.

Fix CURL_CHECK_DEF so that when the expansion of the preprocessor symbol results
in a set of double-quoted strings, this macro will now return an expansion which
consists of a single double-q

Fix CURL_CHECK_DEF so that when the expansion of the preprocessor symbol results
in a set of double-quoted strings, this macro will now return an expansion which
consists of a single double-quoted string result of concatenating all of them.

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Initial support of curlbuild.h and curlrules.h which allows
to have a curl_off_t data type no longer gated to off_t.

Autoconf 2.62 has changed the behaviour of the AC_AIX macro which we use.
Prior versions of autoconf defined _ALL_SOURCE if _AIX was defined. But,
autoconf 2.62 version of AC_AIX defines _ALL

Autoconf 2.62 has changed the behaviour of the AC_AIX macro which we use.
Prior versions of autoconf defined _ALL_SOURCE if _AIX was defined. But,
autoconf 2.62 version of AC_AIX defines _ALL_SOURCE along with other four
preprocessor symbols no matter if the system is AIX or not. To keep the
traditional behaviour, as well as an uniform one, across autoconf versions
AC_AIX is replaced with our own internal macro.

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Add a whitespace

Ensure that reserved keyword AC_DEFUN is only used for its purpose.

Removed definition of CURL_CHECK_WORKING_RESOLVER from acinclude.m4 it has
not been in use since revision 1.81 of configure.in 6 years, 9 months ago.

Reinstate the 'aclocal -I m4' in buildconf and 'ACLOCAL_AMFLAGS = -I m4' way of
including our local m4/reentrant.m4 file. This even takes care of including the
file in the distribution tarbal

Reinstate the 'aclocal -I m4' in buildconf and 'ACLOCAL_AMFLAGS = -I m4' way of
including our local m4/reentrant.m4 file. This even takes care of including the
file in the distribution tarball.

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Tests done using 'aclocal -I m4' in buildconf and 'ACLOCAL_AMFLAGS = -I m4
in top Makefile.am triggered a problem that prevented aclocal from running
successfully on SunOS 5.10 with GNU m4 1.

Tests done using 'aclocal -I m4' in buildconf and 'ACLOCAL_AMFLAGS = -I m4
in top Makefile.am triggered a problem that prevented aclocal from running
successfully on SunOS 5.10 with GNU m4 1.4.5 and GNU Autoconf 2.61

A tarball which reproduces mentioned problem is the one dated July-28-2008
http://cool.haxx.se/curl-daily/curl-7.19.0-20080728.tar.gz

We actually don't need all the bells and whistles that the above mechanism
provides. We only need to include our m4/reentrant.m4 file in acinclude.m4
so here we go with this simpler mechanism.

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Assert that SED and GREP are set

simplify multi '#' char comment line

Another step towards detecting if _REENTRANT is already defined or actually
needed, and being able to define it if appropriate for further configure tests
as well as for the generated config

Another step towards detecting if _REENTRANT is already defined or actually
needed, and being able to define it if appropriate for further configure tests
as well as for the generated config file.

Introduced reentrant.m4 intended for our reentrant related autotools/m4 macros.

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cleanup duplicate line

Make sure that configure process tests are done with the same _REENTRANT
setting as the one actually used when finally building the library.

checks for gethostbyaddr_r with 7 and 8 args now also done with -D_REENTRANT

checks for gethostbyname_r with 5 and 6 args now also done with -D_REENTRANT

when recvfrom prototype uses a void pointer for arguments 2, 5 or 6 this will
now cause the definition of RECVFROM_TYPE_ARG2_IS_VOID, RECVFROM_TYPE_ARG5_IS_VOID
or RECVFROM_TYPE_ARG6_IS_VOID,

when recvfrom prototype uses a void pointer for arguments 2, 5 or 6 this will
now cause the definition of RECVFROM_TYPE_ARG2_IS_VOID, RECVFROM_TYPE_ARG5_IS_VOID
or RECVFROM_TYPE_ARG6_IS_VOID, as appropriate.

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Remove showing additional info needed to debug configure
failure to properly detect recvfrom arg types on Solaris

Added "pointer to void" as another data type to check for the sixth argument of
function recvfrom as a result of the info additionally logged when running on a
Solaris system.

The co

Added "pointer to void" as another data type to check for the sixth argument of
function recvfrom as a result of the info additionally logged when running on a
Solaris system.

The compiler error showed that the prototype being used on Solaris was the one
declared in line 427 of "/usr/include/sys/socket.h" as:

function(int,
pointer to void,
unsigned int,
int,
pointer to struct sockaddr,
pointer to void) returning int

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Temporarily show additional info needed to debug configure
failure to properly detect recvfrom arg types on Solaris

RECVFROM_TYPE_ARG2, RECVFROM_TYPE_ARG5 and RECVFROM_TYPE_ARG6 are now defined
to the data type pointed by its respective argument and not the pointer type.

Configure process now checks availability of recvfrom() socket function and
finds out its return type and the types of its arguments. Added definitions
for non-configure systems config files,

Configure process now checks availability of recvfrom() socket function and
finds out its return type and the types of its arguments. Added definitions
for non-configure systems config files, and introduced macro sreadfrom which
will be used on udp sockets as a recvfrom() wrapper.

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fallback to gettimeofday when monotonic clock is unavailable at run-time

make check message wording more precise

fix C style comment