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/2.9/1030_all_glibc-manual-no-perl.patch

 -= BEGIN original header =-

 If we're using a cvs snapshot which updates the source files, and

 perl isn't installed yet, then we can't regen the docs.  Not a big

 deal, so just whine a little and continue on our merry way.

 http://bugs.gentoo.org/60132

 -= END original header =-

 diff -durN glibc-2_9.orig/manual/Makefile glibc-2_9/manual/Makefile

 --- glibc-2_9.orig/manual/Makefile	2006-01-08 07:43:47.000000000 +0100

 +++ glibc-2_9/manual/Makefile	2009-02-02 22:00:53.000000000 +0100

 @@ -104,9 +104,14 @@

  libm-err.texi: stamp-libm-err

  stamp-libm-err: libm-err-tab.pl $(wildcard $(foreach dir,$(sysdirs),\

  						     $(dir)/libm-test-ulps))

 +ifneq ($(PERL),no)

  	pwd=`pwd`; \

  	$(PERL) $< $$pwd/.. > libm-err-tmp

  	$(move-if-change) libm-err-tmp libm-err.texi

 +else

 +	echo "Unable to rebuild math docs, no perl installed"

 +	touch libm-err.texi

 +endif

  	touch $@

  # Generate Texinfo files from the C source for the example programs.