silence most warnings under macOS

For macOS Apple clang version 15.0.0 (clang-1500.3.9.4)
compiler, we have silenced the warnings that can be silenced.

We also updated `.gitignore` for `2014/maffiodo2` and `1995/vanschnitz`.

2013/cable3/Makefile

@@ -94,7 +94,7 @@ CSILENCE+= -Wno-cast-align -Wno-comma -Wno-dollar-in-identifier-extension \
 	-Wno-implicit-int-conversion -Wno-missing-prototypes \
 	-Wno-missing-variable-declarations -Wno-padded -Wno-pedantic \
 	-Wno-poison-system-directories -Wno-shadow -Wno-sign-conversion \
-	-Wno-strict-prototypes
+	-Wno-strict-prototypes -Wno-shorten-64-to-32
 #
 CWARN+= -Weverything
 #

2013/hou/Makefile

@@ -84,7 +84,9 @@ CC= cc
 ifeq "$(findstring $(CLANG),${CC})" "$(CLANG)"
 #
 CSILENCE+= -Wno-comma -Wno-implicit-int-conversion -Wno-missing-variable-declarations \
-	-Wno-poison-system-directories -Wno-shorten-64-to-32
+	-Wno-poison-system-directories -Wno-shorten-64-to-32 \
+	-Wno-float-conversion -Wno-format-nonliteral -Wno-missing-prototypes \
+        -Wno-shadow -Wno-shift-sign-overflow
 #
 CWARN+= -Weverything
 #