build

Auto-detect std::string_view support by default #257

Job	Run time
windows (Win32, standard)	2m 24s
ubuntu (g++, standard)	1m 7s
windows (Win32, PUGIXML_WCHAR_MODE)	1m 37s
ubuntu (g++, PUGIXML_WCHAR_MODE)	1m 8s
windows (Win32, PUGIXML_COMPACT)	1m 38s
ubuntu (g++, PUGIXML_COMPACT)	1m 17s
windows (Win32, PUGIXML_NO_EXCEPTIONS)	1m 11s
ubuntu (g++, PUGIXML_NO_EXCEPTIONS)	1m 1s
windows (x64, standard)	1m 16s
ubuntu (clang++, standard)	49s
windows (x64, PUGIXML_WCHAR_MODE)	1m 33s
ubuntu (clang++, PUGIXML_WCHAR_MODE)	51s
windows (x64, PUGIXML_COMPACT)	1m 19s
ubuntu (clang++, PUGIXML_COMPACT)	53s
windows (x64, PUGIXML_NO_EXCEPTIONS)	1m 57s
ubuntu (clang++, PUGIXML_NO_EXCEPTIONS)	46s
macos (clang++, standard)	45s
macos (clang++, PUGIXML_WCHAR_MODE)	48s
macos (clang++, PUGIXML_COMPACT)	48s
macos (clang++, PUGIXML_NO_EXCEPTIONS)	48s
	23m 56s

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