qtwebengine: Link libatomic on x86/clang/gnu-runtime
qtwebengine: Link libatomic on x86/clang/gnu-runtime

gcc uses intrinsics for atomic<double> but clang does not for x86
when using libstdc++

./media/audio/pulse/pulse_input.cc uses this atomic variable

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

kraj/meta-clang,kraj/meta-clang,kraj/meta-clang