contrib: pthreads: Fix building with llvm-mingw
This avoids doing things with dlltool that llvm-dlltool doesn't implement. I don't see the need of running a second pass with dlltool to produce an output def file and yet another pass to produce an import library out of it; just make the linker output the import library while linking the dll. (If the import library is to be used by MSVC, there is a point in generating it with dlltool instead of with ld though. Even then, there's no point in generating the def file using dlltool though, when it could just be generated by the linker.) Remove an inline declaration on a function that can't be inline-only (static inline). For non-static inline functions in C, the compiler can choose to use the inline function itself, or assume that a definition exists in a different translation unit. In this case, clang seems to not inline ptw32_cond_check_need_init and creates an undefined reference to the same function that should be defined in another translation unit (which doesn't exist). See https://www.greenend.org.uk/rjk/tech/inline.html for more details on this.
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