CVS Commit by dpage: Turns out that wxMac actually supports a macish

Log Message:
-----------
Turns out that wxMac actually supports a macish behaviour of
the "Quit" MenuItem. It works similar to the About and Help menu
handling - you just set s_macEditMenuItemId to the id of
the Exit-Menuitem, and wx takes care of the rest.

Here is is patch (3-liner, including the compiler conditionals)
for this.
[Florian Pflug]

Modified Files:
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    pgadmin3/src/ui:
        frmMain.cpp (r1.128 -> r1.129)