glsl/glcpp: Don't include any newline characters in #error token

glsl/glcpp: Don't include any newline characters in #error token

Some tests were failing because the message printed by #error was including a
'\r' character from the source file in its output.

This is easily avoided by fixing the regular expression for #error to never
include any of the possible newline characters, (neither '\r' nor '\n').

With this commit 2 tests are fixed for each of the '\r' and '\r\n' cases.

Current results after the commit are:

	\r:	137/143 tests pass
	\r\n	142/143 tests pass
	\n\r:	139/143 tests pass

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>