build fix for GCC7, 2nd commit

Signed-off-by: earplov <arpad.lovassy@ericsson.com>

Makefile.cfg

@@ -108,7 +108,7 @@ XMLDIR := default
 CPPFLAGS += -DYY_NO_INPUT
 
 # Flags shared between C and C++
-COMPILERFLAGS := -Wall -Wpedantic -Wextra -Wparentheses -Wmisleading-indentation -Wduplicated-cond -Wnonnull
+COMPILERFLAGS := -Wall
 
 # 'Hardcore' settings
 # Unlikely to work for GCC below 4.x