ltmain.in: Temporary comment update.

On MSYS2, file path conversion will no longer result in libtool hanging,
but the original MSYS will not be able to do file path conversions
without cygpath. Original MSYS support for file path conversions will be
re-added before commit 1377b68b4aed0d6ee3c390131eb763d26e5b642d migrates
to master.

Reported: https://savannah.gnu.org/support/index.php?110901

* build-aux/ltmain.in: Update comment from MSYS to MSYS2.

build-aux/ltmain.in

diff --git a/build-aux/ltmain.in b/build-aux/ltmain.in
index 425de05..7717c8d 100644
--- a/build-aux/ltmain.in
+++ b/build-aux/ltmain.in
@@ -1029,7 +1029,7 @@
 {
   $debug_cmd
 
-  # Since MSYS is packaged with cygpath, call cygpath in $PATH; no need
+  # Since MSYS2 is packaged with cygpath, call cygpath in $PATH; no need
   # to use LT_CYGPATH in this case.
   func_convert_core_msys_to_w32_result=`cygpath "$@" 2>/dev/null |
 	$SED -e 's/[ ]*$//' -e "$sed_naive_backslashify"`