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>

Vampirised from:

  http://landley.net/hg/aboriginal/file/7e0747a665ab/sources/patches/gcc-core-libgcceh.patch

diff -durN gcc-4.2.2.orig/gcc/mklibgcc.in gcc-4.2.2/gcc/mklibgcc.in

--- gcc-4.2.2.orig/gcc/mklibgcc.in	2006-07-04 22:20:01.000000000 +0200

+++ gcc-4.2.2/gcc/mklibgcc.in	2011-08-31 16:24:03.674690016 +0200

@@ -223,8 +223,8 @@

   if [ "$LIBUNWIND" ]; then

     libunwind_a=$dir/libunwind.a

   fi

+  libgcc_eh_a=$dir/libgcc_eh.a

   if [ "$SHLIB_LINK" ]; then

-    libgcc_eh_a=$dir/libgcc_eh.a

     libgcc_s_so=$dir/libgcc_s${SHLIB_EXT}

     if [ "$LIBUNWIND" ]; then

       libunwind_so=$dir/libunwind${SHLIB_EXT}

@@ -889,11 +889,11 @@

   echo '	chmod 644'  ${ldir}/libgcov.a

   echo '	$(RANLIB_FOR_TARGET)' ${ldir}/libgcov.a

-  if [ "$SHLIB_LINK" ]; then

-    echo '	$(INSTALL_DATA)' ${dir}/libgcc_eh.a ${ldir}/

-    echo '	chmod 644'  ${ldir}/libgcc_eh.a

-    echo '	$(RANLIB_FOR_TARGET)' ${ldir}/libgcc_eh.a

+  echo '	$(INSTALL_DATA)' ${dir}/libgcc_eh.a ${ldir}/

+  echo '	chmod 644'  ${ldir}/libgcc_eh.a

+  echo '	$(RANLIB_FOR_TARGET)' ${ldir}/libgcc_eh.a

+  if [ "$SHLIB_LINK" ]; then

     shlib_slibdir_qual=

     os_multilib_dir=`$GCC_FOR_TARGET $flags --print-multi-os-directory`

     if [ "$os_multilib_dir" != . ]; then