http: make the RTSP version check stricter #1665

Job	Run time
cygwin, AM x86_64 openssl R	9m 4s
cygwin, CM x86_64 openssl	6m 20s
linux-mingw, AM gcc	2m 17s
linux-mingw, CM gcc	1m 17s
dl-mingw, CM 9.5.0-x86_64 schannel	8m 37s
dl-mingw, CM 7.3.0-x86_64 schannel U	13m 9s
dl-mingw, CM 6.4.0-i686 schannel !unity	2m 55s
msvc, CM x64-windows schannel MultiSSL U	8m 4s
msvc, CM x64-windows openssl	9m 35s
msvc, CM x64-uwp openssl	4m 27s
msys2, AM x86_64 !proxy	7m 24s
msvc, CM x64-windows libressl	7m 15s
mingw32ce, AM 4.4.0-arm schannel	1m 32s
msys2, AM x86_64 default	4m 48s
msvc, CM x64-windows boringssl	7m 40s
mingw32ce, CM 4.4.0-arm schannel	1m 29s
msys2, CM x86_64 default	5m 31s
msvc, CM x64-windows wolfssl	7m 51s
msys2, AM x86_64 default R	7m 12s
msvc, CM x64-windows mbedtls	8m 30s
mingw, AM x86_64 default	6m 24s
mingw, AM x86_64 c-ares U	9m 52s
mingw, CM x86_64 schannel c-ares U	6m 49s
mingw, CM ucrt-x86_64 schannel R TrackMemory	2m 45s
mingw, CM clang-x86_64 openssl	2m 46s
mingw, CM ucrt-x86_64 schannel uwp	2m 33s
mingw, CM x86_64 schannel dev debug	2m 24s
mingw, CM i686 schannel R	2m 15s
	2h 40m 45s

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