configure: Don't use cross_prefix when invoking pkg-config #736

Job	Run time
build (linux-gcc)	8m 59s
build (linux-clang)	10m 2s
build (macos)	7m 39s
build (linux-i686-gcc)	9m 37s
build (android)	30s
build (windows-cygwin-64)	12m 40s
build (windows-cygwin-32)	14m 15s
build (windows-msys2-64)	10m 35s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	35s
	1h 14m 52s

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