gtef: Fix test [Linux]
gtef: Fix test [Linux]

Only link against -lintl on macOS.

Signed-off-by: Bob W. Hogg <rwhogg@linux.com>

Closes Linuxbrew/homebrew-core#4028.

Signed-off-by: Michka Popoff <7b0496f66f66ee22a38826c310c38b415671b832@gmail.com>

maxim-belkin/homebrew-core,LinuxbrewTestBot/homebrew-core,rwhogg/homebrew-core,Linuxbrew/homebrew-core,Linuxbrew/homebrew-core,LinuxbrewTestBot/homebrew-core,rwhogg/homebrew-core,maxim-belkin/homebrew-core