build

Add Bazel support #215

Job	Run time
windows (Win32, standard)	1m 12s
ubuntu (g++, standard)	1m 1s
windows (Win32, PUGIXML_WCHAR_MODE)	1m 25s
ubuntu (g++, PUGIXML_WCHAR_MODE)	57s
windows (Win32, PUGIXML_COMPACT)	1m 15s
ubuntu (g++, PUGIXML_COMPACT)	1m 4s
windows (Win32, PUGIXML_NO_EXCEPTIONS)	1m 28s
ubuntu (g++, PUGIXML_NO_EXCEPTIONS)	50s
ubuntu (clang++, standard)	45s
windows (x64, standard)	1m 43s
ubuntu (clang++, PUGIXML_WCHAR_MODE)	51s
windows (x64, PUGIXML_WCHAR_MODE)	1m 56s
ubuntu (clang++, PUGIXML_COMPACT)	1m 3s
windows (x64, PUGIXML_COMPACT)	1m 9s
ubuntu (clang++, PUGIXML_NO_EXCEPTIONS)	59s
windows (x64, PUGIXML_NO_EXCEPTIONS)	1m 56s
macos (clang++, standard)	2m 57s
macos (clang++, PUGIXML_WCHAR_MODE)	1m 43s
macos (clang++, PUGIXML_COMPACT)	1m 23s
macos (clang++, PUGIXML_NO_EXCEPTIONS)	1m 57s
	27m 34s

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