complibs/cloog: fix linking with libm

In Ubuntu 11.04 and 11.10, the default options for ld have changed.
--no-copy-dt-needed-entries and --as-needed are now enabled by default, which
causes errors like:

[EXTRA] Checking CLooG/ppl
[DEBUG] ==> Executing: 'make' '-j3' '-s' 'check'
[ALL ] Making check in .
[ALL ] config.status: creating include/cloog/cloog-config.h
[ALL ] config.status: include/cloog/cloog-config.h is unchanged
[ALL ] libtool: link: i686-build_pc-linux-gnu-gcc -Wall -fomit-frame-pointer
-pipe -o cloog cloog.o -L/<snip>/build/static/lib ./.libs/libcloog.a -lm
/<snip>/build/static/lib/libppl_c.a /<snip>/build/static/lib/libpwl.a
/<snip>/build/static/lib/libppl.a /<snip>/build/static/lib/libgmpxx.a
/<snip>/build/static/lib/libgmp.a -lstdc++
[ALL ] /usr/bin/ld: /<snip>/build/static/lib/libppl.a(MIP_Problem.o):
undefined reference to symbol 'sqrt@@GLIBC_2.0'
[ALL ] /usr/bin/ld: note: 'sqrt@@GLIBC_2.0' is defined in DSO
/usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/libm.so so try adding
it to the linker command line
[ALL ] /usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/libm.so:
could not read symbols: Invalid operation
[ALL ] collect2: ld returned 1 exit status
[ERROR] make[2]: *** [cloog] Error 1
[ERROR] make[1]: *** [check-recursive] Error 1

See:
https://wiki.ubuntu.com/NattyNarwhal/ToolchainTransition

This patch fixes these errors by placing '-lm' at the right place on the command
line as libppl requires libm when linking cloog.

Signed-off-by: "Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>

--- glibc-2.7/sysdeps/unix/sysv/linux/dl-osinfo.h.orig	2007-09-15 23:54:08.000000000 +0100

+++ glibc-2.7/sysdeps/unix/sysv/linux/dl-osinfo.h	2008-08-20 09:26:26.000000000 +0100

@@ -83,6 +83,10 @@

   int parts;

   char *cp;

   struct utsname uts;

+  int dotsfound = 0;

+  int versionindex = 0;

+  char *choppoint;

+

   /* Try the uname system call.  */

   if (__uname (&uts))

@@ -102,8 +106,34 @@

   else

     buf = uts.release;

+  /* We are only interested in the first three kernel numbers, so */

+  /* chop off anything past that: */

+

+  choppoint = buf;

+  while (1)

+    {

+      versionindex++;

+      if (versionindex == 63) break;

+      if (*choppoint == '.') dotsfound++;

+      choppoint++;

+      if (dotsfound == 2)

+      {

+        if (*choppoint == '0' || *choppoint == '1'

+          || *choppoint == '2' || *choppoint == '3'

+          || *choppoint == '4' || *choppoint == '5'

+          || *choppoint == '6' || *choppoint == '7'

+          || *choppoint == '8' || *choppoint == '9')

+          continue;

+        else

+          {

+            *choppoint = 0;

+            break;

+          }

+      }

+    }

+

   /* Now convert it into a number.  The string consists of at most

-     three parts.  */

+     three parts.  Now it does, anyway.  ;-)  */

   version = 0;

   parts = 0;

   cp = buf;