build

Modernize use override #303

Job	Run time
ubuntu cmake	13s
macos cmake	16s
windows (Win32, standard)	1m 49s
ubuntu (g++, standard)	42s
windows (Win32, PUGIXML_WCHAR_MODE)	1m 49s
ubuntu (g++, PUGIXML_WCHAR_MODE)	43s
windows (Win32, PUGIXML_COMPACT)	1m 33s
ubuntu (g++, PUGIXML_COMPACT)	46s
windows (Win32, PUGIXML_NO_EXCEPTIONS)	1m 31s
ubuntu (g++, PUGIXML_NO_EXCEPTIONS)	39s
windows (x64, standard)	1m 43s
ubuntu (clang++, standard)	36s
windows (x64, PUGIXML_WCHAR_MODE)	1m 42s
ubuntu (clang++, PUGIXML_WCHAR_MODE)	30s
windows (x64, PUGIXML_COMPACT)	1m 52s
ubuntu (clang++, PUGIXML_COMPACT)	31s
windows (x64, PUGIXML_NO_EXCEPTIONS)	1m 53s
ubuntu (clang++, PUGIXML_NO_EXCEPTIONS)	28s
macos (clang++, standard)	34s
macos (clang++, PUGIXML_WCHAR_MODE)	38s
macos (clang++, PUGIXML_COMPACT)	36s
macos (clang++, PUGIXML_NO_EXCEPTIONS)	38s
	21m 42s

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