[Sanitizer] add sanitizer_posix.cc. Move more various functions into sanitizer_libc: sscanf, munmap, memchr

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@157994 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/sanitizer_common/sanitizer_win.cc b/lib/sanitizer_common/sanitizer_win.cc
index 6bf551c..98414dd 100644
--- a/lib/sanitizer_common/sanitizer_win.cc
+++ b/lib/sanitizer_common/sanitizer_win.cc
@@ -29,6 +29,11 @@
   return 0;
 }
 
+int internal_munmap(void *addr, uptr length) {
+  UNIMPLEMENTED_WIN();
+  return 0;
+}
+
 int internal_close(fd_t fd) {
   UNIMPLEMENTED_WIN();
   return 0;
@@ -58,6 +63,11 @@
   return ret;
 }
 
+int internal_sscanf(const char *str, const char *format, ...) {
+  UNIMPLEMENTED_WIN();
+  return -1;
+}
+
 }  // namespace __sanitizer
 
 #endif  // _WIN32