Fix various "unmapped accelerator key" on MacOs

Add mapping for:
KEY_SEMICOLON
KEY_BACKSPACE
KEY_PAGEUP
KEY_PAGEDOWN
KEY_UP
KEY_DOWN
KEY_RETURN
KEY_BRACKETLEFT
KEY_BRACKETRIGHT

Retrieved from AquaSalFrame::GetKeyName
I would have preferred to use this function and remove custom mapping to avoid dup but mapping is a bit different
eg: in AquaSalFrame::GetKeyName KEY_A to KEY_Z uses sal_Unicode( 'A' + (i - KEY_A) )
In SetAccelerator, we use sal_Unicode( 'a' + (i - KEY_A) )
and when using GetKeyName, LO segfaults.

Change-Id: I3808cdcd1c0566e768a98a211bc1f41ff012a32f
Reviewed-on: https://gerrit.libreoffice.org/30909Tested-by: Julien Nabet <serval2412@yahoo.fr>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

vcl/osx/salmenu.cxx

@@ -714,6 +714,33 @@ void AquaSalMenu::SetAccelerator( unsigned /*nPos*/, SalMenuItem* pSalMenuItem,
             case KEY_EQUAL:
                 nCommandKey='=';
                 break;
+            case KEY_SEMICOLON:
+                nCommandKey=';';
+                break;
+            case KEY_BACKSPACE:
+                nCommandKey=sal_Unicode( 0x232b );
+                break;
+            case KEY_PAGEUP:
+                nCommandKey=sal_Unicode( 0x21de );
+                break;
+            case KEY_PAGEDOWN:
+                nCommandKey=sal_Unicode( 0x21df );
+                break;
+            case KEY_UP:
+                nCommandKey=sal_Unicode( 0x21e1 );
+                break;
+            case KEY_DOWN:
+                nCommandKey=sal_Unicode( 0x21e3 );
+                break;
+            case KEY_RETURN:
+                nCommandKey=sal_Unicode( 0x21a9 );
+                break;
+            case KEY_BRACKETLEFT:
+                nCommandKey='[';
+                break;
+            case KEY_BRACKETRIGHT:
+                nCommandKey=']';
+                break;
             }
         }
     }