[test] remove failing and wrong cygwin test

02-install_files.t assumed old cygwin 1.5 coreutils behaviour,
skipping phony over phony.exe.

This test fails on current cygwin and cygwin64 systems with:

not ok 15 - Production, so 2 files created; 1 file passed over
   Failed test 'Production, so 2 files created; 1 file passed over'
   at t/tools/install/02-install_files.t line 230.
          got: '3'
     expected: '2'
See http://perl514.cpanel.net/build/builders/parrot-cygwin/builds/40/steps/shell_2/logs/stdio
or http://perl514.cpanel.net/build/builders/parrot-cygwin64/builds/41/steps/shell_2/logs/stdio

removed the wrong test.