Merge Cygwin build change from next.

balthisar · balthisar · commit 228d8e90cdde · 2021-07-12T10:03:53.000-04:00
diff --git a/src/forward.h b/src/forward.h
@@ -23,7 +23,7 @@
 #define TY_(str) TYDYAPPEND(prvTidy,str)
 
 /* Internal symbols are prefixed with 'hidden' attr, to avoid exporting */
-#ifdef _WIN32
+#if defined(_WIN32) || defined(__CYGWIN__)
 #define TY_PRIVATE
 #else
 #define TY_PRIVATE __attribute__((__visibility__("hidden")))
