winex11.drv: Replace const pointer parameters with correct non-const pointers

[Andrew Talbot]

Note: In the case of XFONT_LookupCachedFont(), I am just removing the pointless
const qualifier from a pointer parameter (plf): I cannot also constify it in
the normal way, because the pointer is being used for writing.

-- Andy.
---
Changelog:
    winex11.drv: Replace const pointer parameters with correct non-const pointer.

diff -urN a/dlls/winex11.drv/xfont.c b/dlls/winex11.drv/xfont.c
--- a/dlls/winex11.drv/xfont.c	2007-02-06 17:51:12.000000000 +0000
+++ b/dlls/winex11.drv/xfont.c	2007-03-09 21:43:11.000000000 +0000
@@ -400,14 +400,14 @@
 /***********************************************************************
  *           Checksums
  */
-static UINT16   __lfCheckSum( LPLOGFONT16 plf )
+static UINT16   __lfCheckSum( const LOGFONT16 *plf )
 {
     CHAR        font[LF_FACESIZE];
     UINT16      checksum = 0;
-    UINT16 *ptr;
+    const UINT16 *ptr;
     int i;
 
-    ptr = (UINT16 *)plf;
+    ptr = (const UINT16 *)plf;
     for (i = 0; i < 9; i++) checksum ^= *ptr++;
     for (i = 0; i < LF_FACESIZE; i++)
     {
@@ -1033,7 +1033,7 @@
  * font info		- http://www.microsoft.com/kb/articles/q65/1/23.htm
  * Windows font metrics	- http://www.microsoft.com/kb/articles/q32/6/67.htm
  */
-static void XFONT_GetLeading( const LPIFONTINFO16 pFI, const XFontStruct* x_fs,
+static void XFONT_GetLeading( const IFONTINFO16 *pFI, const XFontStruct* x_fs,
 			      INT16* pIL, INT16* pEL, const XFONTTRANS *XFT )
 {
     unsigned long height;
@@ -2727,7 +2727,7 @@
    }
 }
 
-static fontObject* XFONT_LookupCachedFont( const LPLOGFONT16 plf, UINT16* checksum )
+static fontObject* XFONT_LookupCachedFont( const LOGFONT16 *plf, UINT16* checksum )
 {
     UINT16	cs = __lfCheckSum( plf );
     int		i = fontMRU, prev = -1;
@@ -3017,7 +3017,7 @@
 /***********************************************************************
  *           X Device Font Objects
  */
-static X_PHYSFONT XFONT_RealizeFont( const LPLOGFONT16 plf,
+static X_PHYSFONT XFONT_RealizeFont( LPLOGFONT16 plf,
 				     LPCSTR* faceMatched, BOOL bSubFont,
 				     WORD internal_charset,
 				     WORD* pcharsetMatched )