(svn r14641) -Change [Allegro]: when making a debug build revert Allegro's hooks on SIGSEGV/SIGABRT so one can actually use gdb.
-Change: make it more clear that Allegro's failing to find a driver.

Makefile*
bin/*
bundle/*
!bin/data/chars.grf
!bin/data/openttdd.grf
!bin/data/openttdw.grf
!bin/data/opntitle.grf
!bin/scenario/README
!bin/scripts*
config.*
objs/*
src/rev.cpp