Moved the compiling plugins to after the binary is copied over.

(macosX needs the binary to link against for the plugins)

Also updated the plugins/Makefile to use
$(MAKE) -C dir
	instead of
cd dir; make

Kent

release/plugins/Makefile

@@ -32,11 +32,11 @@
 all: textures sequences
 
 textures:
-	cd texture; make;
+	$(MAKE) -C texture
 
 sequences:
-	cd sequence; make;
+	$(MAKE) -C sequence
 
 clean:
-	cd texture; make clean;
-	cd sequence; make clean;
+	$(MAKE) -C texture clean
+	$(MAKE) -C sequence clean