Darwin C++ breaks -Wl

[Ben Hines]

The darwin C++ patch breaks -Wl, options, it causes them to get passed 
to the compiler instead of the linker:

/bin/sh ../libtool --mode=link gcc  -g -O2 -g -Wall 
-Wmissing-declarations -Wmissing-prototypes  -Wl,-stack_size 
-Wl,4048000 -g -Wall -o libgphoto2_port.la -rpath /sw/lib -version-info 
5:1:5 gphoto2-port-info-list.lo gphoto2-port-log.lo 
gphoto2-port-version.lo gphoto2-port.lo gphoto2-port-portability.lo 
gphoto2-port-result.lo -ldl /sw/lib/libintl.dylib 
/sw/lib/libiconv.dylib -lintl
mkdir .libs
rm -fr .libs/libgphoto2_port.la .libs/libgphoto2_port.* 
.libs/libgphoto2_port.*
(cd . && ln -s gphoto2-port-info-list.lo gphoto2-port-info-list.o)
(cd . && ln -s gphoto2-port-log.lo gphoto2-port-log.o)
(cd . && ln -s gphoto2-port-version.lo gphoto2-port-version.o)
(cd . && ln -s gphoto2-port.lo gphoto2-port.o)
(cd . && ln -s gphoto2-port-portability.lo gphoto2-port-portability.o)
(cd . && ln -s gphoto2-port-result.lo gphoto2-port-result.o)
gcc -r -keep_private_externs -nostdlib -o 
.libs/libgphoto2_port.0.5.1.dylib-master.o  gphoto2-port-info-list.lo 
gphoto2-port-log.lo gphoto2-port-version.lo gphoto2-port.lo 
gphoto2-port-portability.lo gphoto2-port-result.lo && gcc -dynamiclib 
-flat_namespace -undefined suppress -o 
.libs/libgphoto2_port.0.5.1.dylib 
.libs/libgphoto2_port.0.5.1.dylib-master.o  -ldl -L/sw/lib -lintl -lc 
-stack_size 4048000 -install_name /sw/lib/libgphoto2_port.0.dylib 
-compatibility_version 6 -current_version 6.1
gcc: 4048000: No such file or directory
gcc: unrecognized option `-stack_size'

When calling "gcc", you need "-Wl,-stack_size", but libtool thinks it 
is calling the linker so apparently strips that.

Also, the new developer tools have an option "-single_modle". We should 
add a check for apple version of gcc 1173 (or ld) and use that instead 
of using the ld -r trickery.

-Ben