Improve the display TESTS_ENVIRONMENT.
Improve the display TESTS_ENVIRONMENT.

	* build-aux/check.mk (am__rst_pre): Fix quotation of $.
	(am__rst_block): New.
	Use it to display TESTS_ENVIRONMENT.

aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport