rename environment.c in env_embedded.c to reflect is functionality

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/tools/.gitignore b/tools/.gitignore
index 157b679..377ca9a 100644
--- a/tools/.gitignore
+++ b/tools/.gitignore
@@ -1,7 +1,7 @@
 /bmp_logo
 /crc32.c
 /envcrc
-/environment.c
+/env_embedded.c
 /gen_eth_addr
 /img2srec
 /md5.c