cppcheck linter fails on Windows due to DOS paths

## Information

**VIM version**
vim 8.1 (2018 may 18)

Operating System: win7

## What went wrong

cppcheck linter doesn't work， gcc linter is ok. I debuged ALELint command, and found:

function! ale#handlers#cppcheck#HandleCppCheckFormat(buffer, lines) abort
...
for l:match in ale#util#GetMatches(a:lines, l:pattern)
if ale#path#IsBufferPath(a:buffer, l:match[1])
IsBufferPath always failed, because tempname() returns "C:\User\ADMINI\~1\AppData\Local\Temp\VIF9297.tmp", but the subdir in buffer name is "Administrator", not ADMINI~1