./make/prefix.patch breaks SVR4 compatibility

[ryao]

Please excuse the lack of a pull request, but I am having too much fun hacking at the moment. Anyway, restoring compatibility is simple:

diff --git a/usr/src/make_src/Make/lib/makestate/src/Variant.mk b/usr/src/make_src/Make/lib/makestate/src/Variant.mk
index a961615..d906559 100644
--- a/usr/src/make_src/Make/lib/makestate/src/Variant.mk
+++ b/usr/src/make_src/Make/lib/makestate/src/Variant.mk
@@ -71,9 +66,9 @@ install: all
        ${INSTALL} -d ${DESTDIR}/${PREFIX}/lib/$(VAR_DIR)
        ${RM} ${DESTDIR}/${PREFIX}/lib$(VAR_DIR)/$(DLIBNAME)
        ${INSTALL} $(DLIBNAME) ${DESTDIR}/${PREFIX}/lib$(VAR_DIR)
-       if [[ -n "$(VAR_DIR)" && ! -h "${DESTDIR}/${PREFIX}/lib/64"  ]]; then \
+       if [ -n "$(VAR_DIR)" -a ! -h "${DESTDIR}/${PREFIX}/lib/64" ]; then \
            cd ${DESTDIR}/${PREFIX}/lib; \
-           ln -s $$(basename $(VAR_DIR)) 64; \
+           ln -s `basename $(VAR_DIR)` 64; \
        else \
                /bin/true; \
        fi

By the way, how did this regression get past your testing?