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>

Original patch from: gentoo/src/patchsets/glibc/2.9/1050_all_glibc-i386-LOAD_PIC_REG.patch

-= BEGIN original header =-

From e41177ea18a77a7f62328293b4fd49ae17482e77 Mon Sep 17 00:00:00 2001

From: Ulrich Drepper <drepper@redhat.com>

Date: Sat, 6 Dec 2008 00:15:17 +0000

Subject: [PATCH] (_dl_tlsdesc_dynamic): Use LOAD_PIC_REG instead of doing things manually.

-= END original header =-

diff -durN glibc-2_9.orig/sysdeps/i386/dl-tlsdesc.S glibc-2_9/sysdeps/i386/dl-tlsdesc.S

--- glibc-2_9.orig/sysdeps/i386/dl-tlsdesc.S	2008-05-13 07:33:06.000000000 +0200

+++ glibc-2_9/sysdeps/i386/dl-tlsdesc.S	2009-02-02 22:00:56.000000000 +0100

@@ -128,8 +128,7 @@

 .Lslow:

 	cfi_adjust_cfa_offset (28)

 	movl	%ebx, 16(%esp)

-	call	__i686.get_pc_thunk.bx

-	addl	$_GLOBAL_OFFSET_TABLE_, %ebx

+	LOAD_PIC_REG (bx)

 	call	___tls_get_addr@PLT

 	movl	16(%esp), %ebx

 	jmp	.Lret