adaint.c: New function __gnat_get_env_vars_case_sensitive...

adaint.c: New function __gnat_get_env_vars_case_sensitive...

2010-09-09  Vincent Celier  <celier@adacore.com>

	* adaint.c: New function __gnat_get_env_vars_case_sensitive, returns 0
	for VMS and Windows, and 1 for all other platforms.
	* adaint.h: New function __gnat_get_env_vars_case_sensitive
	* osint.ads, osint.adb (Canonical_Case_Env_Var_Name): New procedure.
	* prj-ext.adb (Add): Call Canonical_Case_Env_Var_Name instead of
	Canonical_Case_File_Name, as we are dealing with environment variables,
	not files.

From-SVN: r164069