Don't patch popen-noshell twice

Makefile

@@ -176,7 +176,7 @@ fetchthirdparty:
 	cd mupdf && patch -N -p1 < ../mupdf.patch
 	svn co http://popen-noshell.googlecode.com/svn/trunk/ popen-noshell
 	# popen_noshell patch: Make it build on recent TCs, and implement a simple Makefile for building it as a static lib
-	cd popen-noshell && patch -N -p0 < popen_noshell-buildfix.patch
+	cd popen-noshell && tesf -f Makefile || patch -N -p0 < popen_noshell-buildfix.patch
 
 clean:
 	rm -f *.o kpdfview slider_watcher

popen-noshell/popen_noshell-buildfix.patch

@@ -15,7 +15,7 @@ Index: Makefile
 ===================================================================
 --- Makefile	(revision 0)
 +++ Makefile	(working copy)
-@@ -0,0 +1,15 @@
+@@ -0,0 +1,17 @@
 +SRCS=popen_noshell.c
 +
 +OBJS:=$(SRCS:%.c=%.o)
@@ -31,6 +31,8 @@ Index: Makefile
 +clean:
 +	rm -rf *.o
 +	rm -rf libpopen_noshell.a
++
++.PHONY: clean
 
 Property changes on: Makefile
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