build: cleanup pkg-config checks.
build: cleanup pkg-config checks.

Avoid trying being a smartass when pkg-config is not found, it's rare
enough that it shouldn't really matter.

mwgoldsmith/bluray,tourettes/libbluray,vlc-mirror/libbluray,pingflood/libbluray,mwgoldsmith/bluray,ShiftMediaProject/libbluray,UIKit0/libbluray,mwgoldsmith/bluray,Distrotech/libbluray,ace20022/libbluray,ace20022/libbluray,ace20022/libbluray,Distrotech/libbluray,ShiftMediaProject/libbluray,tourettes/libbluray,ace20022/libbluray,UIKit0/libbluray,UIKit0/libbluray,koying/libbluray,mwgoldsmith/bluray,vlc-mirror/libbluray,Azzuro/libbluray,zxlooong/libbluray,ShiftMediaProject/libbluray,Distrotech/libbluray,koying/libbluray,Azzuro/libbluray,EdwardNewK/libbluray,zxlooong/libbluray,pingflood/libbluray,Azzuro/libbluray,koying/libbluray,koying/libbluray,Azzuro/libbluray,EdwardNewK/libbluray,vlc-mirror/libbluray,zxlooong/libbluray,EdwardNewK/libbluray,Distrotech/libbluray,UIKit0/libbluray,vlc-mirror/libbluray,pingflood/libbluray,tourettes/libbluray,ShiftMediaProject/libbluray,tourettes/libbluray,EdwardNewK/libbluray