Instead of erroring out on this:
 #If Win64 Then
   Declare PtrSafe Function aht_apiGetOpenFileName Lib "comdlg32.dll"
 #Else
   Declare Function aht_apiGetOpenFileName Lib "comdlg32.dll"
 #End If
just treat the # commands as remarks and continue on.

This type of coding will become more common as 64bit versions of
Office require such constructs.

Change-Id: I63bfb8cbe9ad3ef35bab4c041d9d94daa7fbba18
Reviewed-on: https://gerrit.libreoffice.org/34518Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Justin Luth <justin_luth@sil.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>