allegro4: Set ALLEGRO_HAVE_MEMCMP
allegro: Set ALLEGRO_HAVE_LIBPTHREAD
allegro: Share more common options between allegro 4 and 5 scripts
allegro4: Remove SGN and ABS macros

FB already has these functions built-in, so there's no need to have them
in the binding at all.
allegro4: Regenerate with latest fbfrog
allegro4: Regenerate with latest fbfrog
allegro: Handle bool
raw: Regenerate with latest fbfrog
allegro: Support ALLEGRO_STATICLINK
Move libpng notes into the makefile
raw: Regenerate with latest fbfrog
allegro4: Regenerate with latest fbfrog
allegro4: Don't expand various constants used in inline functions
allegro4: Drop inline functions

Allegro provides normal versions of these functions, so we don't really
need to worry about translating them.
allegro: Regenerate using fbfrog's -fixunsizedarrays
raw: Update for fbfrog 20070a8f0600d1ab2d96c290c83c4af83d9214a8
raw: alpng 1.3 and algif 1.3
makefile: Split up ALL variable assignment
allegro5: Remove ALLEGRO_ASSERT & co

They're probably intended for internal use mostly...
allegro: Remove PALLETE #define

Since the PALETTE array typedef is solved out to, it doesn't make sense
to keep the PALLETE alias either.