Unbreak with Clang/LLD 9

[jbeich]

Regressed by llvm/llvm-project@1d16515fb407. Found via freebsd#240629.

$ c++ --version
FreeBSD clang version 9.0.0 (tags/RELEASE_900/final 372316) (based on LLVM 9.0.0)
Target: x86_64-unknown-freebsd13.0
Thread model: posix
InstalledDir: /usr/bin
$ c++ -Wl,--version
LLD 9.0.0 (FreeBSD 372316-1300004) (compatible with GNU linkers)

$ git describe --tags --always
v0.0.7-144-g40fcd457b
$ git rev-list --count HEAD
8759

$ cmake -DUSE_SYSTEM_FFMPEG=ON -DUSE_SYSTEM_LIBPNG=ON -GNinja /path/to/rpcs3
$ ninja
[...]
c++: warning: argument unused during compilation: '-no-pie' [-Wunused-command-line-argument]
ld: error: rpcs3/CMakeFiles/rpcs3.dir/main_application.cpp.o: unable to find library from dependent library specifier: opengl32.lib
ld: error: rpcs3/Emu/librpcs3_emu.a(GLGSRender.cpp.o): unable to find library from dependent library specifier: opengl32.lib
ld: error: rpcs3/Emu/librpcs3_emu.a(GLRenderTargets.cpp.o): unable to find library from dependent library specifier: opengl32.lib
ld: error: rpcs3/Emu/librpcs3_emu.a(GLVertexBuffers.cpp.o): unable to find library from dependent library specifier: opengl32.lib
c++: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

http://package18.nyi.freebsd.org/data/headamd64PR240629-default/2019-09-21_22h04m49s/logs/errors/rpcs3-0.0.7.8748.log

[magiruuvelvet]

Same problem on Linux when using a 100% LLVM-based toolchain. I always removed this pragma as workaround to get working binaries 😄