Fix building of pure C++ extensions as static

Author: Scott MacVicar

build/genif.sh

@@ -24,7 +24,7 @@ cd $srcdir
 module_ptrs="$extra_module_ptrs`echo $@ | $awk -f ./build/order_by_dep.awk`"
 
 for ext in ${1+"$@"} ; do
-	header_list="$header_list ext/$ext/*.h"
+	header_list="$header_list ext/$ext/*.h*"
 done
 
 includes=`$awk -f ./build/print_include.awk $header_list`