json_view: one SIMD macro set with the library

The view's vector code follows JSON_NO_SIMD, like the lexer and the float
writer, and skips the CPU check of SSSE3 when the code is compiled for
SSSE3 anyway (__SSSE3__), like the lexer. JSON_VIEW_NO_SIMD and
JSON_VIEW_USE_SSSE3 and their ABI tags _vns and _vssse3 are removed; they
were never released. JSON_NO_SIMD keeps its tag _ns.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

tests/abi/config/default.cpp

@@ -64,14 +64,6 @@ TEST_CASE("default namespace")
         expected += "_ns";
 #endif
 
-#ifdef JSON_VIEW_NO_SIMD
-        expected += "_vns";
-#endif
-
-#ifdef JSON_VIEW_USE_SSSE3
-        expected += "_vssse3";
-#endif
-
         expected += "_v" STRINGIZE(NLOHMANN_JSON_VERSION_MAJOR);
         expected += "_" STRINGIZE(NLOHMANN_JSON_VERSION_MINOR);
         expected += "_" STRINGIZE(NLOHMANN_JSON_VERSION_PATCH) "::basic_json";