dbghelp: Constify some character strings.

dlls/dbghelp/elf_module.c

@@ -1470,7 +1470,7 @@ static BOOL elf_search_and_load_file(struct process* pcs, const WCHAR* filename,
 {
     BOOL                ret = FALSE;
     struct module*      module;
-    static WCHAR        S_libstdcPPW[] = {'l','i','b','s','t','d','c','+','+','\0'};
+    static const WCHAR  S_libstdcPPW[] = {'l','i','b','s','t','d','c','+','+','\0'};
 
     if (filename == NULL || *filename == '\0') return FALSE;
     if ((module = module_is_already_loaded(pcs, filename)))

dlls/dbghelp/macho_module.c

@@ -1160,7 +1160,7 @@ static BOOL macho_search_and_load_file(struct process* pcs, const WCHAR* filenam
 {
     BOOL                ret = FALSE;
     struct module*      module;
-    static WCHAR        S_libstdcPPW[] = {'l','i','b','s','t','d','c','+','+','\0'};
+    static const WCHAR  S_libstdcPPW[] = {'l','i','b','s','t','d','c','+','+','\0'};
     const WCHAR*        p;
 
     TRACE("(%p/%p, %s, 0x%08lx, %p)\n", pcs, pcs->handle, debugstr_w(filename), load_addr,

dlls/dbghelp/symbol.c

@@ -38,7 +38,7 @@
 WINE_DEFAULT_DEBUG_CHANNEL(dbghelp);
 WINE_DECLARE_DEBUG_CHANNEL(dbghelp_symt);
 
-static WCHAR    starW[] = {'*','\0'};
+static const WCHAR starW[] = {'*','\0'};
 
 static inline int cmp_addr(ULONG64 a1, ULONG64 a2)
 {