build

Modernize use override #301

Job	Run time
ubuntu cmake	12s
windows (Win32, standard)	1m 30s
macos cmake	14s
ubuntu (g++, standard)	1s
windows (Win32, PUGIXML_WCHAR_MODE)	2m 19s
ubuntu (g++, PUGIXML_WCHAR_MODE)	22s
windows (Win32, PUGIXML_COMPACT)	1m 41s
ubuntu (g++, PUGIXML_COMPACT)	38s
windows (Win32, PUGIXML_NO_EXCEPTIONS)	1m 39s
ubuntu (g++, PUGIXML_NO_EXCEPTIONS)	22s
windows (x64, standard)	1m 58s
ubuntu (clang++, standard)	35s
windows (x64, PUGIXML_WCHAR_MODE)	1m 28s
ubuntu (clang++, PUGIXML_WCHAR_MODE)	38s
windows (x64, PUGIXML_COMPACT)	1m 58s
windows (x64, PUGIXML_NO_EXCEPTIONS)	1m 27s
ubuntu (clang++, PUGIXML_COMPACT)	39s
ubuntu (clang++, PUGIXML_NO_EXCEPTIONS)	39s
macos (clang++, standard)	29s
macos (clang++, PUGIXML_WCHAR_MODE)	29s
macos (clang++, PUGIXML_COMPACT)	24s
macos (clang++, PUGIXML_NO_EXCEPTIONS)	25s
	20m 7s

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