libstdc++: Fix some warnings seen during bootstrap

libstdc++-v3/ChangeLog:

	* include/bits/locale_facets_nonio.tcc (money_put::__do_get):
	Ignore -Wformat warning for __ibm128 arguments.
	* include/tr1/tuple (ignore): Ignore -Wunused warning.

libstdc++-v3/include/bits/locale_facets_nonio.tcc

@@ -637,6 +637,8 @@ _GLIBCXX_BEGIN_NAMESPACE_LDBL_OR_CXX11
 
 #if defined _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT \
       && defined __LONG_DOUBLE_IEEE128__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wformat" // '%Lf' expects 'long double'
 extern "C"
 __typeof__(__builtin_snprintf) __glibcxx_snprintfibm128 __asm__("snprintf");
 
@@ -671,6 +673,7 @@ __typeof__(__builtin_snprintf) __glibcxx_snprintfibm128 __asm__("snprintf");
       return __intl ? _M_insert<true>(__s, __io, __fill, __digits)
 	            : _M_insert<false>(__s, __io, __fill, __digits);
     }
+#pragma GCC diagnostic pop
 #endif
 
 _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11

libstdc++-v3/include/tr1/tuple

@@ -423,7 +423,7 @@ namespace tr1
   // TODO: Put this in some kind of shared file.
   namespace
   {
-    _Swallow_assign ignore;
+    _Swallow_assign ignore  __attribute__((__unused__));
   } // anonymous namespace
 }