add CUNKNOWN make variables to entry Makefiles

1984/decot/Makefile

@@ -45,9 +45,13 @@ CSILENCE= -Wno-array-bounds -Wno-error -Wno-implicit-function-declaration \
 	  -Wno-pointer-to-int-cast -Wno-return-type -Wno-unused-label -Wno-implicit-int \
 	  -Wno-cast-function-type -Wno-format-extra-args
 
+# Attempt to silence unknown warnings
+#
+CUNKNOWN= -Wno-unknown-warning-option
+
 # Common C compiler warning flags
 #
-CWARN= -Wall -Wextra ${CSILENCE}
+CWARN= -Wall -Wextra ${CSILENCE} ${CUNKNOWN}
 
 # Compiler standard
 #
@@ -55,9 +59,6 @@ CSTD= -std=gnu90
 
 # Compiler bit architecture
 #
-# Some entries require 32-bitness: ARCH= -m32
-# Some entries require 64-bitness: ARCH= -m64
-#
 ARCH=
 
 # Defines that are needed to compile