[skip ci] Use a 'more constexpr-friendy' test for compare() (#34, thanks to @mcskatkat)

Author: martinmoene

test/string-view.t.cpp

@@ -378,12 +378,9 @@ CASE( "string_view: Allows to compare empty string_views as equal via compare(),
 CASE( "string_view: Allows to constexpr-compare string_views via compare(), (1) (C++14)" )
 {
 #if nssv_HAVE_CONSTEXPR_14
-    constexpr char hello[] = "hello";
-    constexpr char world[] = "world";
-
-    static_assert( string_view( hello ).compare( string_view( hello ) ) == 0, "" );
-    static_assert( string_view( hello ).compare( string_view( world ) ) <  0, "" );
-    static_assert( string_view( world ).compare( string_view( hello ) ) >  0, "" );
+    static_assert( string_view( "hello" ).compare( string_view( "hello" ) ) == 0, "" );
+    static_assert( string_view( "hello" ).compare( string_view( "world" ) ) <  0, "" );
+    static_assert( string_view( "world" ).compare( string_view( "hello" ) ) >  0, "" );
 #else
     EXPECT( !!"C++14 constexpr is not available (no C++14)" );
 #endif