Fix typo that breaks builds on big-endian (#2632)

diff --git a/src/google/protobuf/wire_format_lite.cc b/src/google/protobuf/wire_format_lite.cc
index ebc29f1..e46ac40 100644
--- a/src/google/protobuf/wire_format_lite.cc
+++ b/src/google/protobuf/wire_format_lite.cc
@@ -357,11 +357,11 @@
   WireFormatLite::WriteFixed64NoTagToArray(v, dest);
 }
 
-void EncodeSFixedSizeValue(int32 v, uint8* dest) {
+void EncodeFixedSizeValue(int32 v, uint8* dest) {
   WireFormatLite::WriteSFixed32NoTagToArray(v, dest);
 }
 
-void EncodeSFixedSizeValue(int64 v, uint8* dest) {
+void EncodeFixedSizeValue(int64 v, uint8* dest) {
   WireFormatLite::WriteSFixed64NoTagToArray(v, dest);
 }