[Sanitizers] Make OpenFile more portable

llvm-svn: 234410
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_win.cc b/compiler-rt/lib/sanitizer_common/sanitizer_win.cc
index aa3123e..71281c2 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_win.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_win.cc
@@ -160,7 +160,7 @@
   UNIMPLEMENTED();
 }
 
-void *MapWritableFileToMemory(void *addr, uptr size, uptr fd, uptr offset) {
+void *MapWritableFileToMemory(void *addr, uptr size, fd_t fd, uptr offset) {
   UNIMPLEMENTED();
 }
 
@@ -420,7 +420,7 @@
   UNIMPLEMENTED();
 }
 
-uptr OpenFile(const char *filename, FileAccessMode mode) {
+fd_t OpenFile(const char *filename, FileAccessMode mode, error_t *last_error) {
   UNIMPLEMENTED();
 }