Merge r1490294, r1734635, r1749403, r1813116, r1816179, r1817598, r1832198, r1832200...

Merge r1490294, r1734635, r1749403, r1813116, r1816179, r1817598, r1832198, r1832200, r1832277, r1832317 from trunk:

Note that the function will be available in APR.

Silent a smatch warning:
mod_auth_form.c:626 get_form_auth() warn: variable dereferenced before check 'sent_user' (see line 616)

Use 'memcpy' instead of 'strcpy' when the size of the string has already been computed.

Fix compilation failure :

unixd.c: In function ‘ap_unixd_mpm_set_signals’:
unixd.c:579:5: error: implicit declaration of function ‘apr_signal’; did you mean ‘strsignal’? [-Werror=implicit-function-declaration]
     apr_signal(SIGPIPE, SIG_IGN);
     ^~~~~~~~~~
     strsignal

Not sure where it comes from, maybe related to r1812301.

mod_substitute: add runtime traces. PR 61132.

In verify_ocsp_status in ssl_engine_ocsp.c, the log message, "OCSP response not successful: %d" should print the value of r instead of rc.
The value of rc will always be 0.

PR 61876 [sam <sam.eastman.4114 gmail.com>]

Success of 'SHGetMalloc()' should be tested with the SUCCEEDED macro.

/!\   This commit is _NOT COMPILE TESTED_. (I don't have a windows build environment available)

See PR 60086.

Axe some dead code.

See PR 60086.

Fix typo

Fix a potential un-intialized variable usage warning.
This can not be a runtime ixsue, because, in such a case, we would assert and abort before.

 PR 59819.
Submitted by: minfrin, jailletc36, jailletc36, jailletc36, ylavic, jailletc36, jailletc36, jailletc36, jailletc36, jailletc36
Reviewed by: jailletc36, ylavic, covener

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1832607 13f79535-47bb-0310-9956-ffa450edef68