* winver.rc (FileDescription): Remove (R).
	* path.cc (normalize_posix_path): Fix long-standing problem which
	allows to access files via ".." using an invalid POSIX path.
Revert "Proposed changes for removing cygdrive prefix from paths."

This reverts commit 0a45de35387d2c96389e700350be1344672e29f1.
Accept both mount point - msys-like and true posix.
Merge branch 'Cygwin' into develop. Return CompanyName and FileDescription to RedHat and cygwin but leave ProductName as MSYS2.