ICU-12779 do not check U_PLATFORM macros before including ICU headers

X-SVN-Rev: 39457

diff --git a/icu4c/source/i18n/digitlst.cpp b/icu4c/source/i18n/digitlst.cpp
index f68f8bb32270b82d5aabe3e99c405e27fc3f176d..a3b3406ca64cd87d2cdac1426daffcad56c5a5f0 100644 (file)
--- a/icu4c/source/i18n/digitlst.cpp
+++ b/icu4c/source/i18n/digitlst.cpp
@@ -26,7 +26,7 @@
 ******************************************************************************
 */
 
-#if U_PLATFORM == U_PF_CYGWIN
+#if defined(__CYGWIN__) && !defined(_GNU_SOURCE)
 #define _GNU_SOURCE
 #endif