dbghelp: Fix symt_find_nearest so that it searches for 64bit addresses on 64bit platforms.

dlls/dbghelp/dbghelp_private.h

@@ -538,7 +538,7 @@ extern struct module* symt_cmp_addr_module;
 extern int          symt_cmp_addr(const void* p1, const void* p2);
 extern void         copy_symbolW(SYMBOL_INFOW* siw, const SYMBOL_INFO* si);
 extern struct symt_ht*
-                    symt_find_nearest(struct module* module, DWORD addr);
+                    symt_find_nearest(struct module* module, DWORD_PTR addr);
 extern struct symt_compiland*
                     symt_new_compiland(struct module* module, unsigned long address,
                                        unsigned src_idx);

dlls/dbghelp/symbol.c

@@ -900,7 +900,7 @@ static void symt_get_length(struct module* module, const struct symt* symt, ULON
 }
 
 /* assume addr is in module */
-struct symt_ht* symt_find_nearest(struct module* module, DWORD addr)
+struct symt_ht* symt_find_nearest(struct module* module, DWORD_PTR addr)
 {
     int         mid, high, low;
     ULONG64     ref_addr, ref_size;