[CLEANUP] remove unused DEBUG_PARSE_NO_SPEEDUP define

This one has become useless with the new HTTP parser.
diff --git a/Makefile b/Makefile
index 61451c2..d5bd2fd 100644
--- a/Makefile
+++ b/Makefile
@@ -109,8 +109,7 @@
 #### Debug settings
 # You can enable debugging on specific code parts by setting DEBUG=-DDEBUG_xxx.
 # Currently defined DEBUG macros include DEBUG_FULL, DEBUG_MEMORY, DEBUG_FSM,
-# DEBUG_HASH and DEBUG_PARSE_NO_SPEEDUP. Please consult sources for exact
-# meaning or do not use at all.
+# and DEBUG_HASH. Please check sources for exact meaning or do not use at all.
 DEBUG =
 
 #### Additional include and library dirs