Update static-serialization.swift

Avoid `%host_triple` to appease macOS.

Author: compnerd

test/IRGen/static-serialization.swift

@@ -1,5 +1,5 @@
 // RUN: %empty-directory(%t)
-// RUN: %swift-target-frontend -static -emit-module -emit-module-path %t/StaticLibrary.swiftmodule/%host_triple.swiftmodule -module-name StaticLibrary -DSTATIC_LIBRARY %s
+// RUN: %swift-target-frontend -static -emit-module -emit-module-path %t/StaticLibrary.swiftmodule -module-name StaticLibrary -DSTATIC_LIBRARY %s
 // RUN: %swift-target-frontend -I%t -S %s -emit-ir -o - | %FileCheck %s
 
 #if STATIC_LIBRARY