mklib: replace if/expr with case

Saves forking an expr for every object.

bin/mklib

@@ -281,18 +281,21 @@ case $ARCH in
 	    # expand any .a objects into constituent .o files.
 	    NEWOBJECTS=""
 	    DELETIA=""
-	    for OBJ in ${OBJECTS} ; do
-		if [ `expr match $OBJ '.*\.a'` -gt 0 ] ; then
+	    for OBJ in $OBJECTS ; do
+		case $OBJ in
+		    *.a)
 			# extract the .o files from this .a archive
 			FILES=`ar t $OBJ`
 			ar x $OBJ
 			NEWOBJECTS="$NEWOBJECTS $FILES"
 			# keep track of temporary .o files and delete them below
 			DELETIA="$DELETIA $FILES"
-		else
+			;;
+		    *)
 			# ordinary .o file
 			NEWOBJECTS="$NEWOBJECTS $OBJ"
-		fi
+			;;
+		esac
 	    done
 
             # make lib