[CMake] FindBZip2 fails to set BZIP2_NEED_PREFIX if using x64

[Luca Beldi]

Hi Everyone,
I posted a bug ticket (https://gitlab.kitware.com/cmake/cmake/issues/18701) but I’m not sure if this is a bug in CMake or I just missed something.

Configuring a project that contains find_package(BZip2)

cmake "Visual Studio 14 2015" ../

will correctly produce
-- Looking for BZ2_bzCompressInit
-- Looking for BZ2_bzCompressInit - found
while

cmake "Visual Studio 14 2015" -A x64 ../

will erroneously show
-- Looking for BZ2_bzCompressInit
-- Looking for BZ2_bzCompressInit - not found

Using "NMake Makefiles" as generator will bear identical results for the 32 and 64 bit versions.
Tested with CMake 3.13.1

Anyone experienced this before?
Thanks,
Luca Beldi
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