Changes needed for dEQP integration

[asuonpaa]

These changes allow to skip everything else but the shadertrap library. OpenGL wrapper header is used in place of gl32.h when compiling for dEQP.

[paulthomson]

Looks good to me! Left a few comments, some of which don't necessarily need addressing now.

[paulthomson]

One more comment. Regarding the CI failure, this looks like cppcheck is suddenly failing to compile. I assume this is because cppcheck was incorrectly not including a header somewhere and the system's C++ headers have now changed, exposing the bug. We could try updating cppcheck and/or we could make the cppcheck build always use clang's libc++ (which we download explicitly).

[paulthomson]

One more comment. Regarding the CI failure, this looks like cppcheck is suddenly failing to compile. I assume this is because cppcheck was incorrectly not including a header somewhere and the system's C++ headers have now changed, exposing the bug. We could try updating cppcheck and/or we could make the cppcheck build always use clang's libc++ (which we download explicitly).

@afd

[afd]

If you rebase, main now incorporates a temporary workaround for the cppcheck build problem.