complibs/cloog: create missing m4 dir

Because we now patch configure.in and configure, the Makefile quicks
in a re-build rule as the source files are now more recent than the
bundled generated files, and that fails because the m4 directory
is missing, although on some systems where aclocal is not installed,
the re-build rule does nothing (except a warning).

Always create tht directory.

Reported-by: Per Arnold Blaasmo <per-arnold.blaasmo@atmel.com>
[Also thanks to Thomas De Schampheleire <patrickdepinguin@gmail.com>
for some digging works on this issue]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

--- glibc-2.7/glibc-ports-2.7.orig/sysdeps/unix/sysv/linux/arm/nptl/sysdep-cancel.h	2007-06-06 19:27:04.000000000 +0200

+++ glibc-2.7/glibc-ports-2.7/sysdeps/unix/sysv/linux/arm/nptl/sysdep-cancel.h	2008-05-18 16:57:21.000000000 +0200

@@ -73,6 +73,9 @@

 # define DOCARGS_5	DOCARGS_4

 # define UNDOCARGS_5	UNDOCARGS_4

+# define DOCARGS_6    DOCARGS_5

+# define UNDOCARGS_6  UNDOCARGS_5

+

 # ifdef IS_IN_libpthread

 #  define CENABLE	bl PLTJMP(__pthread_enable_asynccancel)

 #  define CDISABLE	bl PLTJMP(__pthread_disable_asynccancel)