Remove unused -DBASEGFX_STATIC_LIBRARY

...introduced in b9d1006e "re-base on ALv2
code," probably due to a merge conflict or something like that.

Change-Id: Ib38cd24e935f951482ba99f483a419a9a7782ae8

sdext/StaticLibrary_pdfimport_s.mk

@@ -27,7 +27,6 @@ $(eval $(call gb_StaticLibrary_set_include,pdfimport_s,\
 ))
 
 $(eval $(call gb_StaticLibrary_add_defs,pdfimport_s,\
-	-DBASEGFX_STATIC_LIBRARY \
     -DBOOST_SPIRIT_USE_OLD_NAMESPACE \
 ))