Remove use of an old hack that takes advantage of the auto-dereference
behavior of the if() command to detect if a variable is defined. The
hack has the form:
if("${VAR} MATCHES "^${VAR}$")
where "${VAR}" is a macro argument reference. Use if(DEFINED) instead.
This also avoids warnings for CMake Policy CMP0054.
Remove our curl CMake build files since upstream now provides some.
After merging the upstream versions we may then port them to build
inside CMake and take code from our old build files as needed.
Since commit 7d47c693 (Drop compatibility with CMake < 2.4, 2013-10-08)
we no longer need to use the configure_file IMMEDIATE option to support
compatibility modes less than 2.0.
Utilities/cmcurl/CMake provides macros with the same file names and
macro names as others in Modules, but with different interfaces. We
rename the curl ones to avoid conflict.
Brad King
Daniele E. Domenichelli