Allow cross compiling #17
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The Makefile already calls gcc to link together mame, so use $(CC) instead of $(LD) for the final link step.
Within the Makefile, mame is first linked together and then stripped. If the strip step fails, the end result is an unstripped mame binary. Running 'make' again will not try to re-strip it because a file named 'mame' now exists. Modify the final steps of the build process. Place the unstripped binary into $(OBJ), and the stripped binary into $(PWD) as before.
So as to allow mame4all-pi to be built via cross-compilation, honor the environment variable CROSS_COMPILE as a prefix to build tools. Then to match autotools standards, rename the variable "CPP" to "CXX". All build tools' names can now be overridden by the calling environment.
Attempt to detect if pkg-config is installed. If so, then use SDL's pc file for its CFLAGS and LIBS. Otherwise, default back to the hard-coded values that were previously within the Makefile.
If pkg-config is installed, use VideoCore Shared Memory (VCSM)'s pc file for its CFLAGS and LIBS. Otherwise, default back to the hard-coded values that were previously within the Makefile.
If pkg-config is installed, use EGL's pc file for its CFLAGS and LIBS. Otherwise, default back to the hard-coded values that were previously within the Makefile.
If pkg-config is installed, use glib-2.0's pc file for its CFLAGS and LIBS. Otherwise, default back to the hard-coded values that were previously within the Makefile.
If pkg-config is installed, use alsa's pc file for its CFLAGS and LIBS. Otherwise, default back to the hard-coded values that were previously within the Makefile.
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I modified the mame4all-pi build scripts to allow for cross-compilation. This was needed in my case, as that I used Buildroot to construct a custom MAME system.
Caution: I have not tried these changes on Raspbian. For someone using Raspbian, please check if my changes results in a still working mame binary, prior to accepting my pull request.