oleaut32: Constify some variables

[Andrew Talbot]

Changelog:
    oleaut32: Constify some variables.

diff -urN a/dlls/oleaut32/typelib.c b/dlls/oleaut32/typelib.c
--- a/dlls/oleaut32/typelib.c	2007-06-25 13:30:03.000000000 +0100
+++ b/dlls/oleaut32/typelib.c	2007-07-29 00:08:17.000000000 +0100
@@ -147,7 +147,7 @@
 /*
  * Find a typelib key which matches a requested maj.min version.
  */
-static BOOL find_typelib_key( REFGUID guid, WORD *wMaj, WORD *wMin )
+static BOOL find_typelib_key( REFGUID guid, const WORD *wMaj, WORD *wMin )
 {
     static const WCHAR typelibW[] = {'T','y','p','e','l','i','b','\\',0};
     WCHAR buffer[60];
@@ -1425,7 +1425,7 @@
  *
  *  Functions for reading MSFT typelibs (those created by CreateTypeLib2)
  */
-static inline unsigned int MSFT_Tell(TLBContext *pcx)
+static inline unsigned int MSFT_Tell(const TLBContext *pcx)
 {
     return pcx->pos;
 }
@@ -2588,7 +2588,7 @@
 }
 
 
-static BSTR TLB_MultiByteToBSTR(char *ptr)
+static BSTR TLB_MultiByteToBSTR(const char *ptr)
 {
     DWORD len;
     WCHAR *nameW;
@@ -2602,7 +2602,7 @@
     return ret;
 }
 
-static BOOL TLB_GUIDFromString(char *str, GUID *guid)
+static BOOL TLB_GUIDFromString(const char *str, GUID *guid)
 {
   char b[3];
   int i;
@@ -2624,14 +2624,14 @@
   return TRUE;
 }
 
-static WORD SLTG_ReadString(char *ptr, BSTR *pBstr)
+static WORD SLTG_ReadString(const char *ptr, BSTR *pBstr)
 {
     WORD bytelen;
     DWORD len;
     WCHAR *nameW;
 
     *pBstr = NULL;
-    bytelen = *(WORD*)ptr;
+    bytelen = *(const WORD*)ptr;
     if(bytelen == 0xffff) return 2;
     len = MultiByteToWideChar(CP_ACP, 0, ptr + 2, bytelen, NULL, 0);
     nameW = HeapAlloc(GetProcessHeap(), 0, len * sizeof(WCHAR));
@@ -2641,12 +2641,12 @@
     return bytelen + 2;
 }
 
-static WORD SLTG_ReadStringA(char *ptr, char **str)
+static WORD SLTG_ReadStringA(const char *ptr, char **str)
 {
     WORD bytelen;
 
     *str = NULL;
-    bytelen = *(WORD*)ptr;
+    bytelen = *(const WORD*)ptr;
     if(bytelen == 0xffff) return 2;
     *str = HeapAlloc(GetProcessHeap(), 0, bytelen + 1);
     memcpy(*str, ptr + 2, bytelen);