silence warnings under macOS for cc, clang and gcc

Used the following script to check for warnings
not silenced via ${CSILENCE}:

```sh
find ???? -mindepth 1 -maxdepth 1 -type d | while read dir; do
(cd "$dir"; echo =-=-= "$dir" =-=-= ; csilence -v 1 clobber all ; echo ; csilence -v 1 clobber alt)
done 2>&1 | less
```

1985/applin/Makefile

@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-logical-op-parentheses
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-logical-op-parentheses \
+	-Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #

1985/august/Makefile

@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-main \
-	-Wno-unused-parameter -Wno-unused-variable
+	-Wno-unused-parameter -Wno-unused-variable -Wno-deprecated-non-prototype
 
 # Common C compiler warning flags
 #

1985/lycklama/Makefile

@@ -85,7 +85,7 @@ CC= cc
 ifeq ($(CC),clang)
 #
 CSILENCE+= -Wno-implicit-int-conversion -Wno-poison-system-directories \
-	-Wno-unused-macros
+	-Wno-unused-macros -Wno-strict-prototypes
 #
 CWARN+= -Weverything
 #

1985/shapiro/Makefile

@@ -39,7 +39,7 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
-	-Wno-parentheses -Wno-string-plus-int
+	-Wno-parentheses -Wno-string-plus-int -Wno-strict-prototypes
 
 # Common C compiler warning flags
 #

1985/sicherman/Makefile

@@ -38,7 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-comment
+CSILENCE= -Wno-comment -Wno-deprecated-non-prototype -Wno-main -Wno-pedantic \
+	-Wno-return-type -Wno-strict-prototypes -Wno-unused-parameter
 
 # Common C compiler warning flags
 #
@@ -83,7 +84,8 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-poison-system-directories
+CSILENCE+= -Wno-poison-system-directories -Wno-comma -Wno-missing-prototypes \
+	-Wno-unused-macros
 #
 CWARN+= -Weverything
 #