[WASM] Add WASI OS condition for stdlib/public/Differentiation/TgmathDerivatives.swift.gyb

Author: kateinoigakukun

stdlib/public/Differentiation/TgmathDerivatives.swift.gyb

@@ -16,7 +16,7 @@ import Swift
 
 #if os(macOS) || os(iOS) || os(tvOS) || os(watchOS)
   import Darwin.C.tgmath
-#elseif os(Linux) || os(FreeBSD) || os(OpenBSD) || os(PS4) || os(Android) || os(Cygwin) || os(Haiku)
+#elseif os(Linux) || os(FreeBSD) || os(OpenBSD) || os(PS4) || os(Android) || os(Cygwin) || os(Haiku) || os(WASI)
   import Glibc
 #elseif os(Windows)
   import MSVCRT