regen/embed.pl: Move declaration to first use

Author: khwilliamson

regen/embed.pl

@@ -59,8 +59,6 @@ BEGIN
 $has_compat_macro{$_} = 1 for @have_compatibility_macros;
 my %perl_compats;   # Have 'perl_' prefix
 
-my $unflagged_pointers;
-
 #
 # See database of global and static function prototypes in embed.fnc
 # This is used to generate prototype headers under various configurations,
@@ -132,6 +130,10 @@ sub open_buf_out {
     # take non-initialised GV pointers
 );
 
+# Pointer arguments that erroneously don't indicate whether they can be NULL,
+# etc.
+my $unflagged_pointers;
+
 # generate proto.h
 sub generate_proto_h {
     my ($all)= @_;