[ php-wasm ] Identify `function signature mismatch` in C files

[mho22]

Based on the following review

We should focus on a way to list possible function signature mismatches in each PHP version that could lead to crashes in their wasm form. reference

Suggestions

• Building native php with the regular toolchain and some more verbose warnings logging [ -Wreturn-mismatch, -Wcast-function-type ]
• Running a static analyzer
• We should not scan only php, but also static and shared extensions

References

• https://github.com/WordPress/wordpress-playground/pull/2248
• https://github.com/WordPress/wordpress-playground/issues/2324