Only bootstrap crunchide(1) and build crunchgen(1) when necessary.

The latter needs to be built either if it's used as a cross-tool
(${TARGET_ARCH} != ${MACHINE_ARCH}) or if it has backward compat
issues, like e.g. lack of the AMD64 support.

Makefile.inc1

@@ -668,6 +668,11 @@ _xargs=		usr.bin/xargs
 _yacc=		usr.bin/yacc
 .endif
 
+.if exists(${.CURDIR}/rescue) && !defined(NO_RESCUE) && \
+    ${BOOTSTRAPPING} < 501100
+_crunchgen=	usr.sbin/crunch/crunchgen
+.endif
+
 .if ${BOOTSTRAPPING} < 500019
 _kbdcontrol=	usr.sbin/kbdcontrol
 .endif
@@ -676,7 +681,7 @@ bootstrap-tools:
 .for _tool in ${_strfile} usr.bin/colldef \
     usr.bin/makewhatis usr.bin/rpcgen ${_uudecode} \
     ${_xargs} usr.bin/xinstall ${_yacc} \
-    usr.sbin/config ${_kbdcontrol} \
+    usr.sbin/config ${_crunchgen} ${_kbdcontrol} \
     ${_gperf} ${_groff} gnu/usr.bin/texinfo
 	@${ECHODIR} "===> ${_tool}"; \
 		cd ${.CURDIR}/${_tool}; \
@@ -736,12 +741,17 @@ _kgzip=	usr.sbin/kgzip
 _elf2aout=	usr.bin/elf2aout
 .endif
 
+.if (exists(${.CURDIR}/rescue) && !defined(NO_RESCUE) || \
+    defined(RELEASEDIR)) && \
+    ( ${TARGET_ARCH} != ${MACHINE_ARCH} || ${BOOTSTRAPPING} < 501101 )
+_crunchide=	usr.sbin/crunch/crunchide
+.endif
+
 _xlint=	usr.bin/xlint/lint1 usr.bin/xlint/lint2 usr.bin/xlint/xlint
 
 cross-tools:
 .for _tool in ${_btxld} ${_elf2aout} ${_elf2exe} \
-    gnu/usr.bin/binutils \
-    usr.sbin/crunch/crunchgen usr.sbin/crunch/crunchide \
+    gnu/usr.bin/binutils ${_crunchide} \
     gnu/usr.bin/cc ${_xlint} ${_kgzip}
 	@${ECHODIR} "===> ${_tool}"; \
 		cd ${.CURDIR}/${_tool}; \