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>

 diff -durN gcc-3.4.6.orig/libstdc++-v3/fragment.am gcc-3.4.6/libstdc++-v3/fragment.am

 --- gcc-3.4.6.orig/libstdc++-v3/fragment.am	2003-08-27 02:38:28.000000000 +0200

 +++ gcc-3.4.6/libstdc++-v3/fragment.am	2007-08-15 22:59:09.000000000 +0200

 @@ -18,7 +18,7 @@

  	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once

  # -I/-D flags to pass when compiling.

 -AM_CPPFLAGS = $(GLIBCXX_INCLUDES)

 +AM_CPPFLAGS = $(GLIBCXX_INCLUDES) -I$(toplevel_srcdir)/include

 diff -durN gcc-3.4.6.orig/libstdc++-v3/libmath/Makefile.am gcc-3.4.6/libstdc++-v3/libmath/Makefile.am

 --- gcc-3.4.6.orig/libstdc++-v3/libmath/Makefile.am	2003-08-27 23:29:43.000000000 +0200

 +++ gcc-3.4.6/libstdc++-v3/libmath/Makefile.am	2007-08-15 22:59:09.000000000 +0200

 @@ -32,7 +32,7 @@

  libmath_la_SOURCES = stubs.c

 -AM_CPPFLAGS = $(CANADIAN_INCLUDES)

 +AM_CPPFLAGS = $(CANADIAN_INCLUDES) -I$(toplevel_srcdir)/include

  # Only compiling "C" sources in this directory.

  LIBTOOL = @LIBTOOL@ --tag CC