revert https://trac.osgeo.org/grass/changeset/47081 - GRASS_* variables are treated as system env variables

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@47138 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/display/r_raster.c

@@ -82,7 +82,7 @@ int read_env_file(const char *path)
 	if (G_number_of_tokens(token) != 2)
 	    continue;
 	G_debug(3, "\tread_env_file(): %s=%s", token[0], token[1]);
-	G_setenv(token[0], token[1]);
+	setenv(token[0], token[1], 1);
 	G_free_tokens(token);
 	token = NULL;
     }
@@ -124,9 +124,9 @@ int D_open_driver(void)
 	
 	if (v) {
 	    if (p && G_strcasecmp(p, "ps") == 0)
-		G_setenv("GRASS_PSFILE", v);
+		setenv("GRASS_PSFILE", v, 1);
 	    else
-		G_setenv("GRASS_PNGFILE", v);
+		setenv("GRASS_PNGFILE", v, 1);
 	}
 	
 	G_asprintf(&env, "MONITOR_%s_ENVFILE", m);