digest: fix memory leak, fix not quoted 'opaque'

Fix leak regression introduced by 3a6fe0c.

Closes https://github.com/curl/curl/pull/9199

tests: several enumerated type cleanups

To please icc

Closes #9179

tool_paramhlp: fix "enumerated type mixed with another type"

Warning by icc

Closes #9179

tool_writeout: fix enumerated type mixed with another type

Closes #9179

tool_cfgable: make 'synthetic_error' a plain bool

The specific reason was not used.

Closes #9179

tool_paramhlp: make check_protocol return ParameterError

"enumerated type mixed with another type"

Closes #9179

tool_formparse: fix variable may be used before its value is set

Warning by icc

Closes #9179

sendf: skip storing HTTP headers if HTTP disabled

Closes #9179

url: enumerated type mixed with another type

Follow-up to 1c58e7ae99ce2030213f28b

Closes #9179

urldata: change second proxytype field to unsigned char to match

To avoid "enumerated type mixed with another type"

Closes #9179

http: typecast the httpreq assignment to avoid icc compiler warning

error #188: enumerated type mixed with another type

Closes #9179

urldata: make state.httpreq an unsigned char

To match set.method used for the same purpose.

Closes #9179

splay: avoid using -1 in unsigned variable

To fix icc compiler warning integer conversion resulted in a change of sign

Closes #9179

sendf: store the header type in an usigned char to avoid icc warnings

Closes #9179

multi: fix the return code from Curl_pgrsDone()

It does not return a CURLcode. Detected by the icc compiler warning
"enumerated type mixed with another type"

Closes #9179

sendf: make Curl_debug a void function

As virtually no called checked the return code, and those that did
wrongly treated it as a CURLcode. Detected by the icc compiler warning:
enum

sendf: make Curl_debug a void function

As virtually no called checked the return code, and those that did
wrongly treated it as a CURLcode. Detected by the icc compiler warning:
enumerated type mixed with another type

Closes #9179

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http_chunks: remove an assign + typecast

As it caused icc to complain: "pointer cast involving 64-bit pointed-to
type"

Closes #9179

vtls: make Curl_ssl_backend() return the enum type curl_sslbackend

To fix the icc warning enumerated type mixed with another type

Closes #9179

curl-compilers.m4: make icc use -diag* options and disable two warnings

-wd and -we are deprecated and are now -diag-disable and -diag-error

Disable warning 1024 and 2259

C

curl-compilers.m4: make icc use -diag* options and disable two warnings

-wd and -we are deprecated and are now -diag-disable and -diag-error

Disable warning 1024 and 2259

Closes #9179

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GHA: add two Intel compiler CI jobs

Closes #9179

curl-functions.m4: check whether atomics can link rather than just compile

Some build toolchains support C11 atomics (i.e., _Atomic types), but
will not link the associated atomics runti

curl-functions.m4: check whether atomics can link rather than just compile

Some build toolchains support C11 atomics (i.e., _Atomic types), but
will not link the associated atomics runtime unless a flag is passed. In
such an environment, linking an application with libcurl.a can fail due
to undefined symbols for atomic load/store functions.

I encountered this behavior when upgrading curl to 7.84.0 and attempting
to build with Solaris Studio 12.6. Solaris provides the flag
-xatomic=[gcc | studio], allowing users to link to one of two atomics
runtime implementations. However, if the user does not provide this
flag, then neither runtime is linked. This led to builds failing in CI.

Closes #9190

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curl-wolfssl.m4: add options header when building test code

Needed for certain configurations of wolfSSL. Otherwise, missing header
error may occur.

Tested with OpenWrt.

curl-wolfssl.m4: add options header when building test code

Needed for certain configurations of wolfSSL. Otherwise, missing header
error may occur.

Tested with OpenWrt.

Closes #9187

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ftp: use a correct expire ID for timer expiry

This was an accurate error pointed out by the icc warning: enumerated
type mixed with another type

Ref: #9179
Closes #9184

sendf: fix paused header writes since after the header API

Regression since d1e4a67

Reported-by: Sergey Ogryzkov
Fixes #9180
Closes #9182

mprintf: fix *dyn_vprintf() when out-of-memory

Follow-up to 0e48ac1f99a. Torture-testing 1455 would lead to a memory
leak otherwise.

Closes #9185