build system cleanup: rename FEATURE_AWK_MATH to FEATURE_AWK_LIBM;
 disable parsing test applet.

diff --git a/Config.in b/Config.in
index 3cb9a4b..f575e91 100644
--- a/Config.in
+++ b/Config.in
@@ -494,8 +494,8 @@
 	  will be supported in head, tail, and fold. (Note: should
 	  affect renice too.)
 
-config PARSE
-	bool "Uniform config file parser debugging applet: parse"
+### config PARSE
+### 	bool "Uniform config file parser debugging applet: parse"
 
 endmenu