make lyx versions distinguishable in desktop menus

[Kornel Benko]

Unix only:
Using suffixed lyx, we install the lyx-desktop for different versions with
different file name, but with the same 'Name'-entry.

Selecting the desired version with the desktop menu is difficult if there
is more than one lyx version installed.

        Kornel

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diff --git a/lib/lyx.desktop.in b/lib/lyx.desktop.in
index 68a5ccb..64ec892 100644
--- a/lib/lyx.desktop.in
+++ b/lib/lyx.desktop.in
@@ -1,7 +1,7 @@
 [Desktop Entry]
 Version=1.0
 Type=Application
-Name=LyX
+Name=LyX@program_suffix@
 GenericName=Document Processor
 Comment=High level LaTeX frontend
 Keywords=WYSIWYG;WYSIWYM;TeX;LaTeX;GUI;frontend;editor;