[scripts/vcpkg_install_make] Keep LOGFILE_ROOT undefined since CMake 3.31.0

[WangWeiLin-MV]

Fix #43163, cmake_parse_arguments(PARSE_ARGV) processed arg_LOGFILE_ROOT become empty string rather than undefined since CMake 3.31

Remove the empty string LOGFILE_ROOT in vcpkg_install_make.cmake to keep arg_LOGFILE_ROOT undefined.

There is no empty string LOGFILE_ROOT argument call in other functions.

Related

• [vcpkg] Set CMP0174 NEW #42045

Reference

See https://cmake.org/cmake/help/v3.31/policy/CMP0174.html

Prior to CMake 3.31, no variable would be defined if the value given after a single-value keyword was an empty string.

For the NEW behavior, cmake_parse_arguments(PARSE_ARGV) always defines a variable for each keyword given in the arguments, even a single-value keyword with an empty string as its value or no value at all.

Test

Example port libcsv installation tests pass with the following triplets:

• x64-linux (CMake 3.30.1 and CMake 3.31.3)
• x64-windows (CMake 3.30.1 and CMake 3.31.3)