Fix ZTS build for Alpine (musl libc)

[mvorisek]

fix#8160

credits go to @cmb69, thanks!

discussion 804420b#r68129969

[mvorisek]

@cmb69 please see the 2nd commit

it seems the JIT/ASM code use _tsrm_ls_cache: initial-exec even initial-exec string is not directly mentioned as after the 1st commit, I was still getting:

 Warning: Failed loading Zend extension 'opcache.so' (tried: /usr/local/lib/php/extensions/no-debug-zts-20210902/opcache.so (Error relocating /usr/local/lib/php/extensions/no-debug-zts-20210902/opcache.so: _tsrm_ls_cache: initial-exec TLS resolves to dynamic definition in /usr/local/lib/php/extensions/no-debug-zts-20210902/opcache.so), /usr/local/lib/php/extensions/no-debug-zts-20210902/opcache.so.so (Error loading shared library /usr/local/lib/php/extensions/no-debug-zts-20210902/opcache.so.so: No such file or directory)) in Unknown on line 0

the 2nd commit fixes the ZTS build issues on Alpine, however if such fix is correct (I am not quite sure), then the condition must be exactly the same in all places which is not the case, compare:

php-src/TSRM/TSRM.h

Line 150 in abd9529

#if !__has_attribute(tls_model) || defined(__FreeBSD__) || defined(__MUSL__) || defined(__HAIKU__)

and

php-src/TSRM/TSRM.c

Line 739 in abd9529

#elif defined(__x86_64__) && defined(__GNUC__) && !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__MUSL__)

and

php-src/ext/opcache/jit/zend_jit_x86.dasc

Line 2977 in abd9529

#if defined(__has_attribute) && __has_attribute(tls_model) && !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__MUSL__)

[mvorisek]

@dstogov, you are the author of TSRM/JIT code, can you please review this PR?

[mvorisek]

based on docker-library/php#1076 (comment) comment, this patch is tested to be working on Alpine/musl

[dstogov]

Looks good. Please merge.