Remove WITHOUT_CAPSICUM build support

Capsicum is non-optional as of c24c117b96 ("Remove
WITHOUT_{CAPSICUM,CASPER} options").

`#ifndef WITHOUT_CAPSICUM` is left in the source for the benefit of
downstream consumers, but is never defined in FreeBSD.

Reviewed by:	oshogbo
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D42077

share/mk/src.opts.mk

@@ -218,7 +218,6 @@ __DEFAULT_NO_OPTIONS = \
     ZONEINFO_LEAPSECONDS_SUPPORT \
 
 __REQUIRED_OPTIONS = \
-    CAPSICUM \
     CASPER
 
 # LEFT/RIGHT. Left options which default to "yes" unless their corresponding
@@ -383,10 +382,6 @@ BROKEN_OPTIONS+= TESTS
 # Force some options off if their dependencies are off.
 # Order is somewhat important.
 #
-.if ${MK_CAPSICUM} == "no"
-MK_CASPER:=	no
-.endif
-
 .if ${MK_SOURCELESS} == "no"
 MK_SOURCELESS_HOST:=	no
 MK_SOURCELESS_UCODE:= no

tools/build/options/WITHOUT_CAPSICUM

@@ -1 +0,0 @@
-This option has no effect.

usr.bin/xz/Makefile

@@ -43,10 +43,6 @@ CFLAGS+=	-DHAVE_CONFIG_H \
 		-I${LZMALIBDIR} \
 		-I${XZDIR}/common
 
-.if ${MK_CAPSICUM} == "no"
-CFLAGS+=	-DWITHOUT_CAPSICUM
-.endif
-
 LIBADD=	lzma
 
 .include <bsd.prog.mk>