mouseemu: drop unnecessary/wrong comment

The original intention was to use the makefile, but that turned
out to be more work than just installing it manually, but the
comment was left over.

srcpkgs/mouseemu/template

@@ -18,8 +18,6 @@ case "$XBPS_TARGET_MACHINE" in
 esac
 
 do_build() {
-	# build it ourselves because no point in patching the makefile...
-	# but let the makefile install
 	${CC} ${CFLAGS} ${LDFLAGS} -o mouseemu mouseemu.c
 }