When running "make all" in the root directory on a system where SELinux
is not installed and where $DESTDIR targets a directory where the
libraries have been installed, the build fails in mcstrans/utils with
the following error:
transcon.c:7:10: fatal error: 'selinux/selinux.h' file not found
and then:
/usr/bin/ld: cannot find -lselinux
Fix this by adding -I$(PREFIX)/include to CFLAGS and -L$(LIBDIR) to
LDLIBS like other subdirectories do.
While at it, remove the useless -L../src parameter.
Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>