Use '=' instead of '==' in /bin/sh scripts to avoid portability

problems.

tools/findfunc

@@ -1,6 +1,6 @@
 #!/bin/sh
 name="$1"
-if [ "$name" == "" ] ; then
+if [ "$name" = "" ] ; then
     echo -n 'Function: '
     read name;
 fi

tools/font_convert.sh

@@ -109,7 +109,7 @@ for i in "${FONTS[@]}"; do
 done;
 
 for i in *.bdf; do
-    if [ "$i" == "*.bdf" ]; then
+    if [ "$i" = "*.bdf" ]; then
        echo "No fonts extracted"; rm -rf "$TMPDIR"; exit 0; 
     fi;
     bdftopcf "$i" | gzip -c > ${i%.???}.pcf.gz;