silence compiler warnings for RHEL 9 Linux

We updated ${CSILENCE} Makefile variables for entries in an attempt to
minimize compiler warnings.  This was tested using
gcc version 11.4.1 20230605 (Red Hat 11.4.1-2) (GCC).

TODO: Recheck macOS clang to see if any new warnings have occur
      under macOS clang.

2012/blakely/Makefile

@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-unused-parameter \
-	-Wno-strict-prototypes
+	  -Wno-strict-prototypes -Wno-builtin-declaration-mismatch \
+	  -Wno-misleading-indentation -Wno-parentheses
 
 # Common C compiler warning flags
 #
@@ -85,9 +86,11 @@ CC= cc
 ifeq "$(findstring $(CLANG),${CC})" "$(CLANG)"
 #
 CSILENCE+= -Wno-comma -Wno-float-conversion -Wno-float-equal \
-	-Wno-implicit-int-conversion -Wno-missing-prototypes \
-	-Wno-missing-variable-declarations -Wno-poison-system-directories \
-	-Wno-shadow -Wno-sign-conversion -Wno-strict-prototypes -Wno-unused-macros
+	   -Wno-implicit-int-conversion -Wno-missing-prototypes \
+	   -Wno-missing-variable-declarations -Wno-poison-system-directories \
+	   -Wno-shadow -Wno-sign-conversion -Wno-strict-prototypes \
+	   -Wno-unused-macros -Wno-extra-semi-stmt -Wno-unsafe-buffer-usage \
+	   -Wno-unknown-warning-option
 #
 CWARN+= -Weverything
 #