Add sysroot_path for cross compiling in libtool-1.5.10

[Julian Chu]

Hi,

I have a cross compiling toolchain which use libtool-1.5.10.
The toolchain place binaries, libraries ... in another path
(ex:/usr/local/toolchain/).

However, the *.la files were created with another path, it looks like

$ cat libpng12.la |grep libdir
libdir='/usr/lib'

Actually, the libpng12.la was placed in /usr/local/toolchain/usr/lib.

I had made a patch that let libtoo-1.5.10 support SYSROOT_PATH.
Before people use libtool to cross compilie, he can add a sysroot path
in *libdir* if he export LIBTOOL_SYSROOT_PATH first.

ex: 

$export LIBTOOL_SYSROOT_PATH=/usr/local/foo

Once libtool try to read in libdir='/usr/lib' in la file, it will
replace it with libdir='/usr/local/foo/usr/lib'

I add the patch as attachment.

Best Regards,

-Julian

add_sysroot_function.patch
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