build

Warn if PUGIXML_STRING_VIEW is set without CMAKE_CXX_STANDARD #248

Job	Run time
windows (Win32, standard)	2m 2s
ubuntu (g++, standard)	1m 3s
windows (Win32, PUGIXML_WCHAR_MODE)	1m 33s
ubuntu (g++, PUGIXML_WCHAR_MODE)	1m 11s
windows (Win32, PUGIXML_COMPACT)	1m 45s
ubuntu (g++, PUGIXML_COMPACT)	1m 11s
windows (Win32, PUGIXML_NO_EXCEPTIONS)	1m 49s
ubuntu (g++, PUGIXML_NO_EXCEPTIONS)	59s
windows (Win32, PUGIXML_STRING_VIEW)	1m 34s
ubuntu (g++, PUGIXML_STRING_VIEW)	1m 5s
windows (x64, standard)	1m 56s
ubuntu (clang++, standard)	58s
windows (x64, PUGIXML_WCHAR_MODE)	1m 45s
ubuntu (clang++, PUGIXML_WCHAR_MODE)	48s
windows (x64, PUGIXML_COMPACT)	1m 40s
ubuntu (clang++, PUGIXML_COMPACT)	50s
windows (x64, PUGIXML_NO_EXCEPTIONS)	1m 35s
ubuntu (clang++, PUGIXML_NO_EXCEPTIONS)	47s
windows (x64, PUGIXML_STRING_VIEW)	1m 55s
ubuntu (clang++, PUGIXML_STRING_VIEW)	48s
macos (clang++, standard)	48s
macos (clang++, PUGIXML_WCHAR_MODE)	55s
macos (clang++, PUGIXML_COMPACT)	51s
macos (clang++, PUGIXML_NO_EXCEPTIONS)	49s
macos (clang++, PUGIXML_STRING_VIEW)	46s
	31m 23s

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