fixup! Add functionality for converting UNIX paths in arguments and e…

…nvironment variables to Windows form for native Win32 applications.

With this commit, the POSIX-to-Windows conversion also leaves Git's
`<rev>:./<name>` syntax alone. Such a string would otherwise be mistaken
for indicating a path list, but path lists are expected to contain only
absolute paths, which would not be the case here.

This fixes Git's t1506-rev-parse-diagnosis.sh

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

winsup/cygwin/msys2_path_conv.cc

@@ -372,6 +372,14 @@ path_type find_path_start_and_type(const char** src, int recurse, const char* en
             // Avoid mangling IPv6 addresses
             if (it + 1 < end && it[1] == ':')
                 goto skip_p2w;
+
+            // Leave Git's <rev>:./name syntax alone
+            if (it + 1 < end && it[1] == '.') {
+                if (it + 2 < end && it[2] == '/')
+                    goto skip_p2w;
+                if (it + 3 < end && it[2] == '.' && it[3] == '/')
+                    goto skip_p2w;
+            }
             break;
         }
         ++it;