Fix casts with const pointers

Author: simonwagner

nacl_irt_interfaces.h

@@ -100,21 +100,21 @@ static inline int nacl_startup_argc(const uint32_t info[]) {
   return info[NACL_STARTUP_ARGC];
 }
 
-static inline char **nacl_startup_argv(const uint32_t *info) {
-  return (char **) &info[NACL_STARTUP_ARGV];
+static inline char* const *nacl_startup_argv(const uint32_t *info) {
+  return (char* const*) &info[NACL_STARTUP_ARGV];
 }
 
 static inline int nacl_startup_envc(const uint32_t info[]) {
   return info[NACL_STARTUP_ENVC];
 }
 
-static inline char **nacl_startup_envp(const uint32_t *info) {
+static inline char* const *nacl_startup_envp(const uint32_t *info) {
   return &nacl_startup_argv(info)[nacl_startup_argc(info) + 1];
 }
 
-static inline Elf32_auxv_t *nacl_startup_auxv(const uint32_t *info) {
-  char **envend = &nacl_startup_envp(info)[nacl_startup_envc(info) + 1];
-  return (Elf32_auxv_t *) envend;
+static inline const Elf32_auxv_t *nacl_startup_auxv(const uint32_t *info) {
+  char* const* envend = &nacl_startup_envp(info)[nacl_startup_envc(info) + 1];
+  return (const Elf32_auxv_t *) envend;
 }
 
 #endif