glsl/glcpp: Fix #pragma to not over-increment the line-number count

Previously, the #pragma directive was swallowing an entire line, (including
the final newline). At that time it was appropriate for it to increment the
line count.

More recently, our handling of #pragma changed to not include the newline. But
the code to increment yylineno stuck around. This was causing __LINE__ to be
increased by one more than desired for every #pragma.

Remove the bogus, extra increment, and add a test for this case.

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

src/glsl/glcpp/glcpp-lex.l

@@ -291,8 +291,6 @@ HEXADECIMAL_INTEGER	0[xX][0-9a-fA-F]+[uU]?
 	 * Simply pass them through to the main compiler's lexer/parser. */
 <HASH>(extension|pragma)[^\r\n]* {
 	BEGIN INITIAL;
-	yylineno++;
-	yycolumn = 0;
 	RETURN_STRING_TOKEN (PRAGMA);
 }
 

src/glsl/glcpp/tests/141-pragma-and-__LINE__.c

@@ -0,0 +1,6 @@
+Line 1 /* Test for a bug where #pragma was throwing off the __LINE__ count. */
+Line __LINE__ /* Line 2 */
+#pragma Line 3
+Line __LINE__ /* Line 4 */
+#pragma Line 5
+Line __LINE__ /* Line 6 */

src/glsl/glcpp/tests/141-pragma-and-__LINE__.c.expected

@@ -0,0 +1,6 @@
+Line 1
+Line 2
+#pragma Line 3
+Line 4
+#pragma Line 5
+Line 6