http: simplify the check for auth methods #1656

Job	Run time
cygwin, AM x86_64 openssl R	9m 22s
cygwin, CM x86_64 openssl	7m 35s
linux-mingw, AM gcc	2m 23s
linux-mingw, CM gcc	1m 19s
dl-mingw, CM 9.5.0-x86_64 schannel	9m 32s
dl-mingw, CM 7.3.0-x86_64 schannel U	9m 3s
dl-mingw, CM 6.4.0-i686 schannel !unity	2m 50s
msvc, CM x64-windows schannel MultiSSL U	27m 43s
msvc, CM x64-windows openssl	11m 7s
msvc, CM x64-uwp openssl	4m 14s
msvc, CM x64-windows libressl	8m 59s
msys2, AM x86_64 !proxy	7m 36s
msvc, CM x64-windows boringssl	9m 31s
msys2, AM x86_64 default	4m 54s
msvc, CM x64-windows wolfssl	8m 7s
msys2, CM x86_64 default	5m 40s
msvc, CM x64-windows mbedtls	9m 49s
msys2, AM x86_64 default R	6m 58s
mingw, AM x86_64 default	6m 31s
mingw, AM x86_64 c-ares U	10m 13s
mingw, CM x86_64 schannel c-ares U	7m 20s
mingw, CM ucrt-x86_64 schannel R TrackMemory	2m 45s
mingw, CM clang-x86_64 openssl	2m 53s
mingw, CM ucrt-x86_64 schannel uwp	2m 31s
mingw, CM x86_64 schannel dev debug	2m 24s
mingw, CM i686 schannel R	2m 17s
	3h 3m 36s

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