Remove WITHOUT_GNU and WITHOUT_GNU_SUPPORT src.conf.knobs

These have no effect (and WITHOUT_GNU is documented as having no
effect). I intend to later introduce a WITHOUT_GPL knob to serve a
similar purpose as WITHOUT_GNU's previously documented intent, but with
a more accurate name. To avoid confusion over the transition though just
remove the existing, nonfunctional ones.

share/man/man5/src.conf.5

@@ -1,6 +1,6 @@
-.\" DO NOT EDIT-- this file is automatically generated.
+.\" DO NOT EDIT-- this file is generated by tools/build/options/makeman.
 .\" $FreeBSD$
-.Dd April 18, 2017
+.Dd April 19, 2017
 .Dt SRC.CONF 5
 .Os
 .Sh NAME
@@ -700,19 +700,6 @@ Set to build
 .Pp
 This is a default setting on
 arm/arm, arm/armeb, arm/armv6 and sparc64/sparc64.
-.It Va WITHOUT_GNU
-Set to not build contributed GNU software as a part of the base system.
-This option can be useful if the system built must not contain any code
-covered by the GNU Public License due to legal reasons.
-.Bf -symbolic
-The option has no effect yet.
-.Ef
-When set, it enforces these options:
-.Pp
-.Bl -item -compact
-.It
-.Va WITHOUT_GNU_SUPPORT
-.El
 .It Va WITHOUT_GNUCXX
 Do not build the GNU C++ stack (g++, libstdc++).
 This is the default on platforms where clang is the system compiler.
@@ -736,8 +723,6 @@ Set to not build GNU
 .It Va WITHOUT_GNU_GREP_COMPAT
 Set this option to omit the gnu extensions to grep from being included in
 BSD grep.
-.It Va WITHOUT_GNU_SUPPORT
-Set to build some programs without optional GNU support.
 .It Va WITHOUT_GPIO
 Set to not build
 .Xr gpioctl 8

share/mk/src.opts.mk

@@ -96,7 +96,6 @@ __DEFAULT_YES_OPTIONS = \
     FTP \
     GAMES \
     GCOV \
-    GNU \
     GNU_DIFF \
     GNU_GREP \
     GNU_GREP_COMPAT \
@@ -450,7 +449,6 @@ MK_${vv:H}:=	${MK_${vv:T}}
 .for var in \
     BLACKLIST \
     BZIP2 \
-    GNU \
     INET \
     INET6 \
     KERBEROS \

tools/build/options/WITHOUT_GNU

@@ -1,7 +0,0 @@
-.\" $FreeBSD$
-Set to not build contributed GNU software as a part of the base system.
-This option can be useful if the system built must not contain any code
-covered by the GNU Public License due to legal reasons.
-.Bf -symbolic
-The option has no effect yet.
-.Ef

tools/build/options/WITHOUT_GNU_SUPPORT

@@ -1,2 +0,0 @@
-.\" $FreeBSD$
-Set to build some programs without optional GNU support.