(memory.h): Don't try to read it if it doesn't exist.

From-SVN: r4420

gcc/fixincludes

@@ -863,8 +863,8 @@ fi
 # many other systems have similar text but correct versions of the file.
 # To ensure only Sun's is fixed, we grep for a likely unique string.
 file=memory.h
-if egrep '/\*	@\(#\)memory\.h 1\.[2-4] 8./../.. SMI; from S5R2 1\.2	\*/' $file > /dev/null; then
-  if [ -r $file ] && [ ! -r ${LIB}/$file ]; then
+if [ -r $file ] && egrep '/\*	@\(#\)memory\.h 1\.[2-4] 8./../.. SMI; from S5R2 1\.2	\*/' $file > /dev/null; then
+  if [ ! -r ${LIB}/$file ]; then
     cp $file ${LIB}/$file >/dev/null 2>&1 || echo "Can't copy $file"
     chmod +w ${LIB}/$file 2>/dev/null
     chmod a+r ${LIB}/$file 2>/dev/null