package/gstreamer/gst-plugins-base: Fix build on x86 if emmintrin.h is available but can't be used

I stumbled across this error using a musl-based allyesconfig but I
doubt it is related to musl. The autobuilders did not catch this
problem yet but the patch I found fits my config (BR2_i386=y,
BR2_x86_i586=y) and it solved the problem right away.

[Peter: pick patches from upstream git instead of downloading from alphine]
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>