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>

# Part-2 of mingw C library options: development libraries

config MINGW_DIRECTX

    bool

    prompt "Include DirectX development files"

config MINGW_OPENGL

    bool

    prompt "Include OpenGL development files"

config MINGW_PDCURSES

    bool

    prompt "Include PDCurses (NCurses library) development files"

choice

    bool

    prompt "PDCurses library version"

    depends on MINGW_PDCURSES

config MINGW_PDCURSES_V_3_4

    bool

    prompt "3.4"

# CT_INSERT_VERSION_ABOVE

# Don't remove above line!

config MINGW_PDCURSES_V_select

    bool

    prompt "Other version"

endchoice

config MINGW_PDCURSES_VERSION

    string

    prompt "PDCurses library version" if MINGW_PDCURSES_V_select

    default "3.4" if MINGW_PDCURSES_V_3_4

# CT_INSERT_VERSION_STRING_ABOVE

# Don't remove above line!

    help

      Enter the version number of the PDCurses library to use

config MINGW_GNURX

    bool

    prompt "Include GnuRX (regex library) development files"

choice

    bool

    prompt "GnuRX library version"

    depends on MINGW_GNURX

config MINGW_GNURX_V_2_5_1

    bool

    prompt "2.5.1"

# CT_INSERT_VERSION_ABOVE

# Don't remove above line!

config MINGW_GNURX_V_select

    bool

    prompt "Other version"

endchoice

config MINGW_GNURX_VERSION

    string

    prompt "GnuRX library version" if MINGW_GNURX_V_select

    default "2.5.1" if MINGW_GNURX_V_2_5_1

# CT_INSERT_VERSION_STRING_ABOVE

# Don't remove above line!

    help

      Enter the version number of the Regex library to use