Disable musttail attribute, not supported by clang on mips64.

Index: Source/WTF/wtf/Compiler.h
--- Source/WTF/wtf/Compiler.h.orig
+++ Source/WTF/wtf/Compiler.h
@@ -290,7 +290,7 @@
 // written for 64-bit may fail to tail call on 32-bit.
 // It also doesn't work on ppc64le: https://github.com/llvm/llvm-project/issues/98859
 // and on Windows: https://github.com/llvm/llvm-project/issues/116568
-#if !defined(MUST_TAIL_CALL) && COMPILER(CLANG) && __SIZEOF_POINTER__ == 8 && defined(__cplusplus) && COMPILER_HAS_CPP_ATTRIBUTE(clang::musttail) && !defined(__powerpc__) && !defined(_WIN32)
+#if !defined(MUST_TAIL_CALL) && COMPILER(CLANG) && __SIZEOF_POINTER__ == 8 && defined(__cplusplus) && COMPILER_HAS_CPP_ATTRIBUTE(clang::musttail) && !defined(__powerpc__) && !defined(_WIN32) && !defined(__mips__)
 #define MUST_TAIL_CALL [[clang::musttail]]
 #define HAVE_MUST_TAIL_CALL 1
 #endif
