stop recursive recursion

Makefile.am

@@ -433,6 +433,9 @@ src/include/switch_version.h: src/include/switch_version.h.in .version $(libfree
 libs/libedit/src/.libs/libedit.a:
 	cd libs/libedit && $(MAKE)
 
+libs/libzrtp/projects/gnu/build/libzrtp.a: 
+	cd libs/libzrtp/projects/gnu && $(MAKE)
+
 libs/curl/Makefile:
 	cd libs/curl && sh ./configure.gnu --prefix=$(prefix)
 
@@ -464,10 +467,6 @@ libs/srtp/libsrtp.la: libs/srtp libs/srtp/.update
 	@cd libs/srtp && $(MAKE)
 	@$(TOUCH_TARGET)
 
-libs/libzrtp/projects/gnu/build/libzrtp.a: libs/libzrtp libs/libzrtp/projects/gnu/.update
-	@cd libs/libzrtp/projects/gnu && $(MAKE)
-	@$(TOUCH_TARGET)
-
 ##
 ## helper targets
 ##