Add NOECHOFILENAMES, if people don't want logspam.

src/Makefile

@@ -539,10 +539,12 @@ OBJS:=$(i_main_o) \
 
 
 ifndef ECHO
+ifndef NOECHOFILENAMES
 define echoName =
 	@echo -- $< ...
 endef
 endif
+endif
 
 # List of languages to compile.
 # For reference, this is the command I use to build a srb2.pot file from the source code.