VBA: allow and ignore compiler directives

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>

basic/source/comp/scanner.cxx

@@ -212,6 +212,7 @@ bool SbiScanner::NextSym()
     eScanType = SbxVARIANT;
     aSym.clear();
     bHash = bSymbol = bNumber = bSpaces = false;
+    bool bCompilerDirective = false;
 
     // read in line?
     if( !pLine )
@@ -246,7 +247,11 @@ bool SbiScanner::NextSym()
     {
         ++pLine;
         ++nCol;
-        bHash = true;
+        //ignore compiler directives (# is first non-space character)
+        if( nOldCol2 == 0 )
+            bCompilerDirective = true;
+        else
+            bHash = true;
     }
 
     // copy character if symbol
@@ -551,7 +556,9 @@ bool SbiScanner::NextSym()
 PrevLineCommentLbl:
 
     if( bPrevLineExtentsComment || (eScanType != SbxSTRING &&
-                                    ( aSym.startsWith("'") || aSym.equalsIgnoreAsciiCase( "REM" ) ) ) )
+                                    ( bCompilerDirective ||
+                                      aSym.startsWith("'") ||
+                                      aSym.equalsIgnoreAsciiCase( "REM" ) ) ) )
     {
         bPrevLineExtentsComment = false;
         aSym = "REM";