File swift-foundation.patch of Package swift-lang

diff --git swift-foundation.orig/Sources/_FoundationCShims/include/_CStdlib.h swift-foundation/Sources/_FoundationCShims/include/_CStdlib.h
index 71e2fd2..a63a9dc 100644
--- swift-foundation.orig/Sources/_FoundationCShims/include/_CStdlib.h
+++ swift-foundation/Sources/_FoundationCShims/include/_CStdlib.h
@@ -51,8 +51,14 @@
 #include <locale.h>
 #endif
 
+#ifndef _GLIBCXX_MATH_H
 #if __has_include(<math.h>)
+#ifndef _MATH_H
+#define _GLIBCXX_MATH_H 1
 #include <math.h>
+#undef _GLIBCXX_MATH_H
+#endif
+#endif
 #endif
 
 #if __has_include(<signal.h>)