[tools] bison: make yacc wrapper relocatable

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@29831 3c298f89-4303-0410-b956-a3cf2f4a3e73

tools/bison/patches/000-relocatable.patch

+--- a/src/Makefile.am
++++ b/src/Makefile.am
+@@ -77,6 +77,7 @@ MOSTLYCLEANFILES = yacc
+ 
+ yacc:
+ 	echo '#! /bin/sh' >$@
++	echo 'test -n "$$STAGING_DIR" && exec "$$STAGING_DIR/../host/bin/bison" -y "$$@"' >>$@
+ 	echo "exec '$(bindir)/bison' -y "'"$$@"' >>$@
+ 	chmod a+x $@
+ 
+--- a/src/Makefile.in
++++ b/src/Makefile.in
+@@ -1352,6 +1352,7 @@ uninstall-am: uninstall-binPROGRAMS unin
+ 
+ yacc:
+ 	echo '#! /bin/sh' >$@
++	echo 'test -n "$$STAGING_DIR" && exec "$$STAGING_DIR/../host/bin/bison" -y "$$@"' >>$@
+ 	echo "exec '$(bindir)/bison' -y "'"$$@"' >>$@
+ 	chmod a+x $@
+