Build Live555 with Visual Studio 2019

Edit win32config,

#!include <ntwin32.mak>
TOOLS32 = "C:\Program Files\Microsoft Visual Studio\2019\[Community, Express, BuildTools, or etc.]\VC\Tools\MSVC\[VERSION, 14.22.27905 for example]\"

for x86, C_COMPILER = "$(TOOLS32)\bin\hostx86\x86\cl"
LINKER = "$(TOOLS32)\bin\hostx86\x86\link"
or for x64, C_COMPILER = "$(TOOLS32)\bin\hostx64\x64\cl"
LINKER = "$(TOOLS32)\bin\hostx64\x64\link"

LINK = $(LINKER) -out:
LINK_OPTS = $(LINK_OPTS_0) $(UI_OPTS) ws2_32.lib