xf86-input-synaptics: Fix QA warnings

xf86-input-synaptics: Fix QA warnings

Remove the .pc file work around since it leads to incorrect paths being encoded and
places the files in the incorrect directory.

WARNING: For recipe xf86-input-synaptics, the following files/directories were installed but not shipped in any package:
WARNING:   /media
WARNING:   /media/build1
WARNING:   /media/build1/poky
WARNING:   /media/build1/poky/build
WARNING:   /media/build1/poky/build/tmp
WARNING:   /media/build1/poky/build/tmp/sysroots
WARNING:   /media/build1/poky/build/tmp/sysroots/qemux86
WARNING:   /media/build1/poky/build/tmp/sysroots/qemux86/usr
WARNING:   /media/build1/poky/build/tmp/sysroots/qemux86/usr/include
WARNING:   /media/build1/poky/build/tmp/sysroots/qemux86/usr/include/xorg
WARNING:   /media/build1/poky/build/tmp/sysroots/qemux86/usr/include/xorg/synaptics-properties.h
WARNING:   /media/build1/poky/build/tmp/sysroots/qemux86/usr/include/xorg/synaptics.h
WARNING:   /usr/share/X11
WARNING:   /usr/share/X11/xorg.conf.d
WARNING:   /usr/share/X11/xorg.conf.d/50-synaptics.conf

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>