glcpp: Test a non-function-like macro using the token paste operator

Apparently we never implemented this, (but we've got a GLSL 1.30 test
in piglit that is exercising this case).

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Carl Worth <cworth@cworth.org>

src/glsl/glcpp/tests/097-paste-with-non-function-macro.c

@@ -0,0 +1,3 @@
+#define PASTE_MACRO one ## token
+PASTE_MACRO
+

src/glsl/glcpp/tests/097-paste-with-non-function-macro.c.expected

@@ -0,0 +1,4 @@
+
+onetoken
+
+