build

style: remove redundant 'virtual' for the 'override'-specified functions #304

Job	Run time
ubuntu cmake	13s
ubuntu (g++, standard)	1m 11s
macos cmake	14s
ubuntu (g++, PUGIXML_WCHAR_MODE)	1m 12s
windows (Win32, standard)	1m 34s
ubuntu (g++, PUGIXML_COMPACT)	1m 14s
windows (Win32, PUGIXML_WCHAR_MODE)	1m 16s
windows (Win32, PUGIXML_COMPACT)	1m 29s
ubuntu (g++, PUGIXML_NO_EXCEPTIONS)	1m 2s
windows (Win32, PUGIXML_NO_EXCEPTIONS)	1m 45s
ubuntu (clang++, standard)	56s
ubuntu (clang++, PUGIXML_WCHAR_MODE)	1m 4s
windows (x64, standard)	1m 46s
ubuntu (clang++, PUGIXML_COMPACT)	58s
windows (x64, PUGIXML_WCHAR_MODE)	1m 40s
windows (x64, PUGIXML_COMPACT)	1m 3s
ubuntu (clang++, PUGIXML_NO_EXCEPTIONS)	53s
macos (clang++, standard)	47s
windows (x64, PUGIXML_NO_EXCEPTIONS)	1m 25s
macos (clang++, PUGIXML_WCHAR_MODE)	43s
macos (clang++, PUGIXML_COMPACT)	47s
macos (clang++, PUGIXML_NO_EXCEPTIONS)	41s
	23m 53s

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