prj-ext.adb: Take into account new environment variable GPR_PROJECT_PATH.

prj-ext.adb: Take into account new environment variable GPR_PROJECT_PATH.

2005-11-14  Vincent Celier  <celier@adacore.com>

	* prj-ext.adb: Take into account new environment variable
	GPR_PROJECT_PATH. Warn if both GPR_PROJECT_PATH and ADA_PROJECT_PATH
	are defined.
	(Prj.Ext elaboration): For each directory in the ADA_PROJECT_PATH,
	normalize its path name, making it absolute and resolving symbolic
	links, and replace the original if resolved path is different.

From-SVN: r106994