Revert "Added configure to gitignore"

This reverts commit 6590ad9d3ddcb44b09c12ed6c8dc0c6818288afc.

.gitignore

@@ -15,7 +15,6 @@ config.h.in
 config.log
 config.status
 config.sub
-configure
 depcomp
 install-sh
 libtool