glcpp/tests: Add test for multiline #line

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/glsl/glcpp/tests/105-multiline-hash-line.c

@@ -0,0 +1,5 @@
+#define X(x) x
+#line X(	\
+	1	\
+       )
+#line 2

src/glsl/glcpp/tests/105-multiline-hash-line.c.expected

@@ -0,0 +1,6 @@
+
+#line 1
+
+
+#line 2
+