Fix compilation failure with ec_elgamal but disable twisted elgamal #1219

Job	Run time
plain (windows-2019)	13m 33s
shared (windows-2019, win64, VC-WIN64A enable-fips)	21m 16s
plain (windows-2022)	13m 4s
shared (windows-2019, win32, VC-WIN32 --strict-warnings no-fips)	24m 19s
shared (windows-2022, win64, VC-WIN64A enable-fips)	21m 34s
minimal (windows-2019)	7m 47s
shared (windows-2022, win32, VC-WIN32 --strict-warnings no-fips)	24m 33s
minimal (windows-2022)	7m 0s
	2h 13m 6s

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