build: remove checks for strtoll() #1624

Job	Run time
cygwin, AM x86_64 openssl R	9m 26s
dl-mingw, CM 9.5.0-x86_64 schannel	7m 41s
cygwin, CM x86_64 openssl	7m 21s
dl-mingw, CM 7.3.0-x86_64 schannel U	8m 16s
dl-mingw, CM 6.4.0-i686 schannel !unity	3m 32s
msys2, AM x86_64 !proxy	7m 41s
msys2, AM x86_64 default	4m 49s
linux-mingw, AM gcc	2m 45s
msys2, CM x86_64 default	5m 42s
linux-mingw, CM gcc	1m 19s
msys2, AM x86_64 default R	7m 4s
mingw, AM x86_64 default	6m 57s
msvc, CM x64-windows schannel MultiSSL U	8m 36s
mingw, AM x86_64 c-ares U	10m 34s
msvc, CM x64-windows openssl	9m 49s
mingw, CM x86_64 schannel c-ares U	6m 48s
msvc, CM x64-uwp openssl	2m 41s
mingw, CM ucrt-x86_64 schannel R TrackMemory	2m 39s
msvc, CM x64-windows libressl	7m 49s
mingw, CM clang-x86_64 openssl	2m 41s
msvc, CM x64-windows boringssl	7m 16s
mingw, CM ucrt-x86_64 schannel uwp	2m 33s
mingw, CM x86_64 schannel dev debug	2m 23s
mingw, CM i686 schannel R	2m 16s
msvc, CM x64-windows wolfssl	9m 5s
msvc, CM x64-windows mbedtls	9m 53s
	2h 37m 36s

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