unposted: vcs_info: Add Vim modelines

... for consistency with all other vcs_info function files.

Functions/VCS_Info/VCS_INFO_patch2subject

@@ -1,3 +1,5 @@
+## vim:ft=zsh
+#
 # This function takes as an argument a filename of a patch and sets $REPLY to
 # a single-line "subject", or unsets it if no subject could be extracted.
 {

Functions/VCS_Info/VCS_INFO_set-branch-format

@@ -1,3 +1,5 @@
+## vim:ft=zsh
+#
 # A function for calling the branch-format hook
 #
 # Return the value to use in REPLY

Functions/VCS_Info/VCS_INFO_set-patch-format

@@ -1,3 +1,5 @@
+## vim:ft=zsh
+#
 # This function is the common guts of the gen-applied-string /
 # gen-unapplied-string / set-patch-format dance of several backends.
 #