internal/rosa/cmake: bake in CMAKE_INSTALL_LIBDIR

There is never a good reason to set this to anything else, and the default value of lib64 breaks everything. This did not manifest on LLVM (which the CMake helper was initially written for) because it did not use this value.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/zstd.go

@@ -16,7 +16,6 @@ func (t Toolchain) newZstd() (pkg.Artifact, string) {
 		Append: []string{"build", "cmake"},
 		Cache: [][2]string{
 			{"CMAKE_BUILD_TYPE", "Release"},
-			{"CMAKE_INSTALL_LIBDIR", "lib"},
 		},
 	}), version
 }