PSTRESS-42 Unable to compile pstress with gcc 9

Details: benhoyt/inih#104

The fix has been included in pstress

src/third_party/inih++/lib/ini.c

@@ -52,7 +52,7 @@ static char* find_char_or_comment(const char* s, char c) {
 
 /* Version of strncpy that ensures dest (size bytes) is null-terminated. */
 static char* strncpy0(char* dest, const char* src, size_t size) {
-  strncpy(dest, src, size);
+  memcpy(dest, src, size);
   dest[size - 1] = '\0';
   return dest;
   }