allegro4: fix build

error message was:

| CMake Error: TRY_RUN() invoked in cross-compiling mode, please set the following cache variables appropriately:
|    ALLEGRO_USE_CONSTRUCTOR_EXITCODE (advanced)
| For details see /home/Superandy/tmp/oe-core-eglibc/work/armv7a-vfp-neon-angstrom-linux-gnueabi/allegro4/4.4.2-r0/allegro-4.4.2/TryRunResults.cmake

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
pingus: add dependency to python-scons-native

error message was:

ERROR: Function failed: do_compile (see /home/Superandy/tmp/oe-core-eglibc/work/armv7a-vfp-neon-angstrom-linux-gnueabi/pingus/0.7.6-r0/temp/log.do_compile.986 for further information)
ERROR: Logfile of failure stored in: /home/Superandy/tmp/oe-core-eglibc/work/armv7a-vfp-neon-angstrom-linux-gnueabi/pingus/0.7.6-r0/temp/log.do_compile.986
Log data follows:
| DEBUG: Executing shell function do_compile
| Traceback (most recent call last):
|   File "/home/Superandy/tmp/oe-core-eglibc/sysroots/x86_64-linux/usr/bin/scons", line 187, in <module>
|     import SCons.Script
| ImportError: No module named SCons.Script
| ERROR: scons build execution failed.
| ERROR: Function failed: do_compile (see /home/Superandy/tmp/oe-core-eglibc/work/armv7a-vfp-neon-angstrom-linux-gnueabi/pingus/0.7.6-r0/temp/log.do_compile.986 for further information)
ERROR: Task 718 (/home/Superandy/data/oe-core/sources/meta-games/recipes-games/pingus/pingus_0.7.6.bb, do_compile) failed with exit code '1'

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>