libraries: honour SPC_DEFAULT_CFLAGS/CXXFLAGS/LDFLAGS and bug fixes

[henderkes]

bzip2, fastlz, jbig, qdbm: thread SPC_DEFAULT_CFLAGS into the hand-rolled Makefile patches and shell compile commands. Backward compatible when the env var is empty.

icu: append SPC_DEFAULT_CXXFLAGS/LDFLAGS to runConfigureICU's CXXFLAGS and LDFLAGS so user flags reach the bundled cxx invocation.

openssl: append user CFLAGS/LDFLAGS after the target name on Configure so options like -flto and -fprofile-* reach the openssl build.

liblz4: replace placeholder Makefile patch ("installewfwef") with a real one that compiles each lib source individually -- clang -flto -c with multiple inputs only writes a .o for the first, silently dropping the rest and leaving liblz4.a with a single object.

libheif: rewrite libheif 1.22+'s C-incompatible
struct heif_bad_pixel { uint32_t row; uint32_t column; }; as a typedef so C consumers compile.

ncurses: filter the clang/zig-cc "N warning(s) generated." stdout line out of MKlib_gen.sh's preprocessor pipe before sed turns it into invalid C in lib_gen.c.

libaom: detect target CPU from SystemTarget instead of hard-coding generic, fall back to generic only when neither nasm nor yasm is available, and turn off examples/tests/tools/docs.

What does this PR do?

Checklist before merging

• If you modified *.php or *.yml, run them locally to ensure your changes are valid:
  • composer cs-fix
  • composer analyse
  • composer test
  • bin/spc dev:lint-config

[github-actions]

StaticPHP Test Bot

Detected: Extensions: none | Libraries: bzip2, fastlz, icu, jbig, libaom, libheif, ncurses, openssl, qdbm | Targets: none
Active labels: none
Config: Linux x86_64 + Windows x86_64 + macOS arm64 | PHP 8.5 NTS