Correct linker library sequence for pdfimport

Otherwise I get a lot of missing fontconfig symbols.

Change-Id: I9bc3e395d54380a36cd6dd73cf95b7f4e4cab54e

sdext/Library_pdfimport.mk

@@ -32,9 +32,9 @@ $(eval $(call gb_Library_use_static_libraries,pdfimport,\
 
 $(eval $(call gb_Library_use_externals,pdfimport,\
 	boost_headers \
-    $(if $(filter-out WNT MACOSX,$(OS)),fontconfig) \
     zlib \
     poppler \
+    $(if $(filter-out WNT MACOSX,$(OS)),fontconfig) \
 ))
 
 $(eval $(call gb_Library_add_exception_objects,pdfimport,\