jdk 1.6 fix build without nawk

[Stuart Henderson]

ok?

Index: Makefile
===================================================================
RCS file: /cvs/ports/devel/jdk/1.6/Makefile,v
retrieving revision 1.16
diff -u -p -r1.16 Makefile
--- Makefile    2 Jul 2010 01:43:12 -0000       1.16
+++ Makefile    3 Sep 2010 19:08:04 -0000
@@ -55,6 +55,7 @@ USE_GMAKE=            Yes
 
 TAR=                   ${LOCALBASE}/bin/gtar
 
+MAKE_FLAGS=            NAWK=/usr/bin/awk
 MAKE_ENV=              ALT_MOTIF_DIR="${LOCALBASE}" \
                        ALT_CUPS_HEADERS_PATH="${LOCALBASE}/include" \
                        ALT_DEVTOOLS_PATH="${LOCALBASE}/bin" \