API: add function to get all extensions present, not just recognized … #1

Job	Run time
cygwin (windows-2019, win64, -DCMAKE_C_COMPILER=gcc --strict-warnings no-fips)	12m 25s
minimal (windows-2019)	9m 23s
minimal (windows-2022)	8m 52s
plain (windows-2019)	16m 52s
plain (windows-2022)	17m 0s
shared (windows-2019, win64, enable-fips)	6m 15s
shared (windows-2019, win32, --strict-warnings no-fips)	6m 22s
shared (windows-2022, win64, enable-fips)	5m 9s
shared (windows-2022, win32, --strict-warnings no-fips)	6m 30s
	1h 28m 48s

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