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-4.2.1.orig/gcc/stmt.c gcc-4.2.1/gcc/stmt.c

 --- gcc-4.2.1.orig/gcc/stmt.c	2007-07-19 05:25:32.000000000 +0200

 +++ gcc-4.2.1/gcc/stmt.c	2007-08-03 20:37:19.000000000 +0200

 @@ -2512,7 +2512,11 @@

  	  use_cost_table

  	    = (TREE_CODE (orig_type) != ENUMERAL_TYPE

  	       && estimate_case_costs (case_list));

 -	  balance_case_nodes (&case_list, NULL);

 +	  /* When optimizing for size, we want a straight list to avoid

 +	     jumps as much as possible. This basically creates an if-else

 +	     chain.  */

 +	  if (!optimize_size)

 +	    balance_case_nodes (&case_list, NULL);

  	  emit_case_nodes (index, case_list, default_label, index_type);

  	  emit_jump (default_label);

  	}

 @@ -3070,6 +3074,7 @@

  	    {

  	      if (!node_has_low_bound (node, index_type))

  		{

 +		  if (!optimize_size) /* don't jl to the .default_label. */

  		  emit_cmp_and_jump_insns (index,

  					   convert_modes

  					   (mode, imode,