Fixed bug #48962 (cURL does not upload files with specified filename).

- Removed unnecessary strlen() call and if statement.

- MFH: Fixed bug #48893 (Problems compiling with Curl)

MFB: Fixed bug #48733 (CURLOPT_WRITEHEADER|CURLOPT_FILE|CURLOPT_STDERR warns
on files that have been opened with r+).

- MFH: fix regression introduced by the fix for #48518 (Ilia, Rasmus)

Simplify original fix for bug #33475

- MFH: Fixed bug #48514 (cURL extension uses same resource name for simple and multi APIs)

MFH: fix bug #48518 (curl crashes when writing into invalid file handle)

reapply the fix

revert the fix for a while

MFH: fix arginfo for curl_multi_info_read()

- fix build, stderr cannot be used as var or struct member

MFH: Fixed bug #48203 (crash when CURLOPT_STDERR is set to regular file)

Fixed bug #48207 (CURLOPT_(FILE|WRITEHEADER options do not error out when
working with a non-writable stream)

sync with HEAD

MFH: Fixed compiler warnings

# (see previous commit message)

MFH

- MFH: use ZEND_ARG_ARRAY_INFO for arginfo_curl_setopt_array

- sync with HEAD

- more WS

- MFH: add CURLPROXY_SOCKS4

- WS

- MFB: - disable file:// when safe_mode or open_basedir are enabled

MFH: Add missing #ifdef for curl version that does not have FTP_FILEMETHOD or IPRESOLVE options. related to fix for bug #39637

- [DOC] a note about the symbol -> version page/doc