GnuTLS | Assorted build fixes and improvements (!2036)

Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/2036

Project:Branches: dueno/gnutls:wip/dueno/usretc to gnutls/gnutls:master
Author:   Daiki Ueno



<!-- Add a description of the new feature/bug fix. Reference any relevant bugs. -->

This includes the fix from !2029 among other minor fixes.

* build: ignore new functions at "make abi-check-latest"

* build: pacify GCC analyzer false-positive in src/ocsptool.c

Without the guard (chain_size - 1), GCC analyzer spews the warning
below, which should be a false-positive:
```
ocsptool.c:532:32: warning: use of uninitialized value 'chain[1]' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]
  532 |                         signer = chain[1];
      |                         ~~~~~~~^~~~~~~~~~
```
* lib: Fix Wunterminated-string-initialization warnings

Building on a newer gcc version (15) results in the following warnings:
```
status_request.c: In function 'client_send':
status_request.c:71:33: warning: initializer-string for array of 'unsigned char' truncates NUL terminator but destination lacks 'nonstring' attribute (6 chars into 5 available) [-Wunterminated-string-initialization]
   71 |         const uint8_t data[5] = "\x01\x00\x00\x00\x00";
      |                                 ^~~~~~~~~~~~~~~~~~~~~~
x86-common.c: In function 'check_phe_partial':
x86-common.c:342:31: warning: initializer-string for array of 'char' truncates NUL terminator but destination lacks 'nonstring' attribute (65 chars into 64 available) [-Wunterminated-string-initialization]
  342 |         const char text[64] = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
      |
      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```
* build: exclude duplicate entries in src/mech-list.h

* build: derive the location of default config file from $sysconfdir

Previously we hard-coded "/etc" as part of the path of the default
configuration file. It is more palatable to respect the --sysconfdir
configure option and locate the file there.

Per recommendation at [1], the path is expanded at "make" time, not at
"configure" time.

1. https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.72/html_node/Installation-Directory-Variables.html

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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