Fixed bug #191 [I opted to go for a warning, since I often tweak configure.in, but don't want to rebuild the entire project] One thing that was lost in the switch from automake to the new build system is that there is now no rule to build configure from configure.in. IMHO, if configure.in gets changed, then at the very least, the build system should print out a warning (better, again IMHO, an error) about this fact. Else, you easily forget about this when modifying configure.in.

aclocal.m4
autom4te*
config.cache
config.log
config.status
configure
Makefile
SDL.dll
stdout.txt
stderr.txt
checkkeys
graywin
loopwave
testalpha
testbitmap
testblitspeed
testcdrom
testdyngl
testerror
testfile
testgamma
testgl
testhread
testiconv
testjoystick
testkeys
testlock
testoverlay
testoverlay2
testpalette
testplatform
testsem
testsprite
testtimer
testver
testvidinfo
testwin
testwm
threadwin
torturethread