Add geogram geometry library to bext #47

Job	Run time
Ubuntu GCC Release Build	42m 0s
macOS Clang Debug Build	1h 13m 0s
macOS Clang Release Build	41m 51s
Ubuntu GCC Debug Build	37m 56s
MSVC - Ninja Debug build	42m 50s
MSVC - Ninja Release build	1h 14m 22s
MSVC - Standard Tools Debug Build	1h 3m 51s
MSVC - Standard Tools Release Build	1h 31m 51s
	7h 47m 41s

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