[Ada] Remove const qualifier on a couple of pointed-to types

[Pierre-Marie de Rodat <derodat@adacore.com>]

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gnat_argv is defined as pointer to const memory in argv.c but declared
and accessed as pointer to mutable memory in rtinit.c, which breaks the
One Definition Rule in C++.  Its initialization is also non-standard.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* argv.c: Add include of <stdlib.h> for the runtime.
	(gnat_argv): Change type to char ** and initialize to NULL.
	(gnat_envp): Likewise.
	* argv-lynxos178-raven-cert.c: Add include of <stdlib.h>.
	(gnat_argv): Change type to char ** and initialize to NULL.
	(gnat_envp): Likewise.

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diff --git a/gcc/ada/argv-lynxos178-raven-cert.c b/gcc/ada/argv-lynxos178-raven-cert.c
--- a/gcc/ada/argv-lynxos178-raven-cert.c
+++ b/gcc/ada/argv-lynxos178-raven-cert.c
@@ -41,6 +41,7 @@
    minimal support for Ada.Command_Line.Command_Name */
 
 #include <sys/types.h>
+#include <stdlib.h>
 #include <string.h>
 
 #ifdef __cplusplus
@@ -53,8 +54,8 @@ extern "C" {
    the binder-generated file so they need to be defined here */
 
 int gnat_argc = 0;
-const char **gnat_argv = (const char **) 0;
-const char **gnat_envp = (const char **) 0;
+char **gnat_argv = NULL;
+char **gnat_envp = NULL;
 
 int
 __gnat_len_arg (int arg_num)


diff --git a/gcc/ada/argv.c b/gcc/ada/argv.c
--- a/gcc/ada/argv.c
+++ b/gcc/ada/argv.c
@@ -44,6 +44,7 @@
 
 #ifdef IN_RTS
 #include "runtime.h"
+#include <stdlib.h>
 #include <string.h>
 #else
 #include "config.h"
@@ -60,14 +61,13 @@ extern "C" {
    envp of the main program is saved under gnat_envp.  */
 
 int gnat_argc = 0;
-const char **gnat_argv = (const char **) 0;
-const char **gnat_envp = (const char **) 0;
+char **gnat_argv = NULL;
+char **gnat_envp = NULL;
 
 #if defined (_WIN32) && !defined (RTX)
 /* Note that on Windows environment the environ point to a buffer that could
    be reallocated if needed. It means that gnat_envp needs to be updated
    before using gnat_envp to point to the right environment space */
-#include <stdlib.h>
 /* for the environ variable definition */
 #define gnat_envp (environ)
 #endif