tools/pkg-config: fix compile on musl hosts

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>

SVN-Revision: 45605

tools/pkg-config/patches/002-musl_host_fixup.patch

+--- a/glib/config.sub
++++ b/glib/config.sub
+@@ -122,9 +122,9 @@ esac
+ # Here we must recognize all the valid KERNEL-OS combinations.
+ maybe_os=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\2/'`
+ case $maybe_os in
+-  nto-qnx* | linux-gnu* | linux-android* | linux-dietlibc | linux-newlib* | \
+-  linux-uclibc* | uclinux-uclibc* | uclinux-gnu* | kfreebsd*-gnu* | \
+-  knetbsd*-gnu* | netbsd*-gnu* | \
++  nto-qnx* | linux-gnu* | linux-android* | linux-dietlibc | linux-musl* | \
++  linux-newlib* | linux-uclibc* | uclinux-uclibc* | uclinux-gnu* | \
++  kfreebsd*-gnu* | knetbsd*-gnu* | netbsd*-gnu* | \
+   kopensolaris*-gnu* | \
+   storm-chaos* | os2-emx* | rtmk-nova*)
+     os=-$maybe_os
+@@ -1354,7 +1354,7 @@ case $os in
+ 	      | -chorusos* | -chorusrdb* | -cegcc* \
+ 	      | -cygwin* | -msys* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
+ 	      | -mingw32* | -linux-gnu* | -linux-android* \
+-	      | -linux-newlib* | -linux-uclibc* \
++	      | -linux-musl* | -linux-newlib* | -linux-uclibc* \
+ 	      | -uxpv* | -beos* | -mpeix* | -udk* \
+ 	      | -interix* | -uwin* | -mks* | -rhapsody* | -darwin* | -opened* \
+ 	      | -openstep* | -oskit* | -conix* | -pw32* | -nonstopux* \