Add MK_FILE to control whether or not to build file(1), libmagic(3), etc

MFC after: 2 weeks
Sponsored by: EMC / Isilon Storage Division

lib/Makefile

@@ -63,7 +63,7 @@ SUBDIR=	${SUBDIR_ORDERED} \
 	libkvm \
 	${_libldns} \
 	liblzma \
-	libmagic \
+	${_libmagic} \
 	libmandoc \
 	libmemstat \
 	libmd \
@@ -195,6 +195,10 @@ _cuse=		libcuse
 _libelftc=	libelftc
 .endif
 
+.if ${MK_FILE} != "no"
+_libmagic=	libmagic
+.endif
+
 .if ${MK_GPIO} != "no"
 _libgpio=	libgpio
 .endif

share/mk/src.opts.mk

@@ -83,6 +83,7 @@ __DEFAULT_YES_OPTIONS = \
     ELFTOOLCHAIN_TOOLS \
     EXAMPLES \
     FDT \
+    FILE \
     FINGER \
     FLOPPY \
     FMTREE \

tools/build/options/WITHOUT_FILE

@@ -0,0 +1,4 @@
+.\" $FreeBSD$
+Set to not build
+.Xr file 1
+and related programs.

usr.bin/Makefile

@@ -48,7 +48,6 @@ SUBDIR=	${_addr2line} \
 	expand \
 	false \
 	fetch \
-	file \
 	find \
 	fmt \
 	fold \
@@ -246,6 +245,10 @@ _size=		size
 _strings=	strings
 .endif
 
+.if ${MK_FILE} != "no"
+SUBDIR+=	file
+.endif
+
 .if ${MK_FINGER} != "no"
 SUBDIR+=	finger
 .endif