[compiler-rt] Suppress -Wunused-result due to ::write when _FORTIFY_S…

…OURCE>0 in glibc

Noticed by Peter Foley.
In glibc, ::write is declared as __attribute__((__warn_unused_result__)) when __USE_FORTIFY_LEVEL is larger than 0.

compiler-rt/lib/fuzzer/FuzzerIOPosix.cpp

@@ -159,7 +159,7 @@ bool IsInterestingCoverageFile(const std::string &FileName) {
 }
 
 void RawPrint(const char *Str) {
-  write(2, Str, strlen(Str));
+  (void)write(2, Str, strlen(Str));
 }
 
 void MkDir(const std::string &Path) {

compiler-rt/lib/scudo/standalone/linux.cpp

@@ -198,7 +198,7 @@ void outputRaw(const char *Buffer) {
     }
     async_safe_write_log(AndroidLogInfo, "scudo", Buffer);
   } else {
-    write(2, Buffer, strlen(Buffer));
+    (void)write(2, Buffer, strlen(Buffer));
   }
 }
 

compiler-rt/lib/ubsan_minimal/ubsan_minimal_handlers.cpp

@@ -10,7 +10,7 @@ extern "C" void ubsan_message(const char *msg);
 static void message(const char *msg) { ubsan_message(msg); }
 #else
 static void message(const char *msg) {
-  write(2, msg, strlen(msg));
+  (void)write(2, msg, strlen(msg));
 }
 #endif