libc: resolve minix clang warnings

Change-Id: If6c42f7346cc1b00b387ae8d3b4f0df3ffb0244f

remove libcompat_minix as library

. get rid of includes in libcompat_minix:
. move configfile.h to minix/include/
. all others are unneeded as they point to other files
. merge the .c files

remove libcompat_minix as library

. get rid of includes in libcompat_minix:
. move configfile.h to minix/include/
. all others are unneeded as they point to other files
. merge the .c files with libc

Change-Id: I5e840c66fb9bc484f377926aa9d66473bbd16259

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