A direct call to echo was intruduced in r333407, which made messages

to be displayed when make is called with -s.  Replace it by ${ECHO}.

Reviewed by:	brd, bdrewery
Approved by:	brd, bdrewery
Sponsored by:	Rubicon Communications, LLC (Netgate)
Differential Revision:	https://reviews.freebsd.org/D16195

share/mk/bsd.files.mk

@@ -80,7 +80,7 @@ _${group}FILES+= ${file}
 
 
 installdirs-${group}:
-	@echo installing dirs ${group}DIR ${${group}DIR}
+	@${ECHO} installing dirs ${group}DIR ${${group}DIR}
 .for dir in ${${group}DIR}
 .if defined(NO_ROOT)
 	${INSTALL} ${${group}TAG_ARGS} -d ${DESTDIR}${dir}