With this patch, it is possible to store configuration options like
NO_CURL=YesPlease or NO_OPENSSL=YesPlease into a file named
config.mak, which will be included in the Makefile.
[jc: redone with suggestion from Daniel Barkalow to just use -include]
Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <junkio@cox.net>