native-xtools: Connect makewhatis.

This speeds up some port staging, namely perl.

Makefile.inc1

@@ -1964,7 +1964,7 @@ NXBMAKE=	${NXBENV} ${MAKE} \
 		MACHINE=${TARGET} MACHINE_ARCH=${TARGET_ARCH} \
 		MK_GDB=no MK_TESTS=no \
 		SSP_CFLAGS= \
-		MK_HTML=no NO_LINT=yes MK_MAN=no \
+		MK_HTML=no NO_LINT=yes MK_MAN=no MK_MAN_UTILS=yes \
 		-DNO_PIC MK_PROFILE=no -DNO_SHARED \
 		-DNO_CPU_CFLAGS MK_WARNS=no MK_CTF=no \
 		MK_CLANG_EXTRAS=no MK_CLANG_FULL=no \
@@ -2038,6 +2038,8 @@ native-xtools: .PHONY
     usr.bin/lex \
     usr.bin/limits \
     usr.bin/lorder \
+    ${_libopenbsd} \
+    ${_makewhatis} \
     usr.bin/mktemp \
     usr.bin/mt \
     usr.bin/patch \