tdf#90298 rescan for bundled extensions when installing Mac langpack

LO only scans for new extensions when the folder's timestamp is newer
than a timestamp file in the user's profile. When installing a
languagepack, the folder is set to the build-time of the package. touch
the dir to set it to install time and thus allow LO to pick up newly
installed dictionaries and thesaurus/hyphenation data.

Change-Id: I888f830d2325774cd98e3624c19d2be19d4d6db2

setup_native/scripts/osx_install_languagepack.applescript

@@ -140,7 +140,8 @@ if (button returned of result) is AbortLabel then
 end if
 *)
 
-set tarCommand to "/usr/bin/tar -C " & quoted form of (choice as string) & " -xjf " & quoted form of sourcedir & "/tarball.tar.bz2"
+-- touch extensions folder to have LO register bundled dictionaries
+set tarCommand to "/usr/bin/tar -C " & quoted form of (choice as string) & " -xjf " & quoted form of sourcedir & "/tarball.tar.bz2 && touch " & quoted form of (choice as string) & "/Contents/Resources/extensions"
 try
 	do shell script tarCommand