package/libsquish: really install shared library

package/libsquish: really install shared library

While testing the new supertuxkart 0.10-beta1 version, the build
failed due to missing libsquash shared library.

Indeed, by default (see config file) the shared library is not build
and all symlinks created by LIBSQUISH_INSTALL_{STAGING,TARGET}_CMDS
are curently broken.

To fix that, add USE_SHARED=1 to LIBSQUISH_MAKE_ENV.

Also add a patch to allow reinstall the package.

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>