ICU-22612 remove obsolete comment
diff --git a/icu4c/source/common/unicode/ptypes.h b/icu4c/source/common/unicode/ptypes.h
index cb46c9e..7f1607e 100644
--- a/icu4c/source/common/unicode/ptypes.h
+++ b/icu4c/source/common/unicode/ptypes.h
@@ -42,13 +42,7 @@
/* NULL, size_t, wchar_t */
#include <stddef.h>
-/*
- * If all compilers provided all of the C99 headers and types,
- * we would just unconditionally #include <stdint.h> here
- * and not need any of the stuff after including platform.h.
- */
-
-/* Find out if we have stdint.h etc. */
+/* More platform-specific definitions. */
#include "unicode/platform.h"
/*===========================================================================*/
