Fix uses of static_assert not guarded by C++11 check

	* include/bits/stl_map.h (map): Disable static assert for C++98 mode.
	* include/bits/stl_multimap.h (multimap): Likewise.

From-SVN: r271884

libstdc++-v3/ChangeLog

+2019-06-03  Jonathan Wakely  <jwakely@redhat.com>
+
+	* include/bits/stl_map.h (map): Disable static assert for C++98 mode.
+	* include/bits/stl_multimap.h (multimap): Likewise.
+
 2019-06-03  François Dumont  <fdumont@gcc.gnu.org>
 
 	Rename variables and cleanup comments.

libstdc++-v3/include/bits/stl_map.h

@@ -118,10 +118,12 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
       __glibcxx_class_requires2(value_type, _Alloc_value_type, _SameTypeConcept)
 #endif
 
+#if __cplusplus >= 201103L
 #if __cplusplus > 201703L || defined __STRICT_ANSI__
       static_assert(is_same<typename _Alloc::value_type, value_type>::value,
 	  "std::map must have the same value_type as its allocator");
 #endif
+#endif
 
     public:
       class value_compare

libstdc++-v3/include/bits/stl_multimap.h

@@ -117,10 +117,12 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
       __glibcxx_class_requires2(value_type, _Alloc_value_type, _SameTypeConcept)
 #endif
 
+#if __cplusplus >= 201103L
 #if __cplusplus > 201703L || defined __STRICT_ANSI__
       static_assert(is_same<typename _Alloc::value_type, value_type>::value,
 	  "std::multimap must have the same value_type as its allocator");
 #endif
+#endif
 
     public:
       class value_compare