Add script for finding unused function checks in configure.in

source/script/find_unused_function_checks.pl

@@ -0,0 +1,37 @@
+#!/usr/bin/perl
+# Arguments:
+#  1: configure.in
+#  2: C files
+#
+# You might want to specify configure.in again in the list of header files 
+# as well, because it also uses some includes.
+# Note that this script does not process any includes, so you might 
+# have to run "cat configure.in */config.m4 > foo.in" first.
+
+my %symbols;
+
+# First, make a list of defines in configure
+$in = shift;
+
+while($tmp = shift) { 
+	open(FI, $tmp);
+	while(<FI>) { 
+		while(/([A-Za-z0-9_]+)/sgm) { 
+			$symbols{$1} = 1;
+		}
+	}
+	close FI;
+}
+
+open(IN, $in) or die("Can't open $in");
+
+while(<IN>) {
+	if(/AC_CHECK_FUNCS\(([\[]*)(.*)([\]]*)\)/) {
+		@hs = split / /, $2;
+		foreach(@hs) { 
+			if($symbols{$_} != 1) { print "$_\n"; }
+		}
+	}
+}
+
+close IN;