Pass CC/CXX/CFLAGS/CXXFLAGS/LDFLAGS to the main crunch exec build.

This fixes --sysroot and other CFLAGS/LDFLAGS not being respected
in the crunchgen build since it is not including bsd.sys.mk and
other files.  For example, this fixes building rescue itself without
--sysroot and other CFLAGS.

Sponsored by:	EMC / Isilon Storage Division

share/mk/bsd.crunchgen.mk

@@ -114,7 +114,10 @@ ${OUTPUTS}: ${CONF}
 # These 2 targets cannot use .MAKE since they depend on the generated
 # ${OUTMK} above.
 ${PROG}: ${OUTPUTS} objs
-	${CRUNCHENV} MAKEOBJDIRPREFIX=${CRUNCHOBJS} ${MAKE} -f ${OUTMK} exe
+	${CRUNCHENV} MAKEOBJDIRPREFIX=${CRUNCHOBJS} \
+	    CC="${CC} ${CFLAGS} ${LDFLAGS}" \
+	    CXX="${CXX} ${CXXFLAGS} ${LDFLAGS}" \
+	    ${MAKE} -f ${OUTMK} exe
 
 objs: ${OUTMK}
 	${CRUNCHENV} MAKEOBJDIRPREFIX=${CRUNCHOBJS} ${MAKE} -f ${OUTMK} objs