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-2.6/sysdeps/unix/sysv/linux/kernel-features.h	2006-07-29 07:43:27.000000000 +0300

+++ glibc-2.6/sysdeps/unix/sysv/linux/kernel-features.h.new	2008-07-26 08:45:06.000000000 +0300

@@ -445,7 +445,7 @@

 /* The *at syscalls were introduced just after 2.6.16-rc1.  Due to the way the

    kernel versions are advertised we can only rely on 2.6.17 to have

    the code.  */

-#if __LINUX_KERNEL_VERSION >= 0x020611

+#if __LINUX_KERNEL_VERSION >= 0x020611 && !defined __alpha__

 # define __ASSUME_ATFCTS	1

 #endif