Compile with a few extra warnings turned on

I found these warnings in this blogpost:
https://kristerw.blogspot.com/2017/09/useful-gcc-warning-options-not-enabled.html

They seemed like the could be useful, even though they were currently not being
triggered.

configure.ac

@@ -175,6 +175,10 @@ CITUSAC_PROG_CC_CFLAGS_OPT([-Wendif-labels])
 CITUSAC_PROG_CC_CFLAGS_OPT([-Wmissing-format-attribute])
 CITUSAC_PROG_CC_CFLAGS_OPT([-Wmissing-declarations])
 CITUSAC_PROG_CC_CFLAGS_OPT([-Wmissing-prototypes])
+# CITUSAC_PROG_CC_CFLAGS_OPT([-Wnull-dereference])
+CITUSAC_PROG_CC_CFLAGS_OPT([-Wduplicated-cond])
+CITUSAC_PROG_CC_CFLAGS_OPT([-Wlogical-op])
+CITUSAC_PROG_CC_CFLAGS_OPT([-Wjump-misses-init])
 CITUSAC_PROG_CC_CFLAGS_OPT([-Wshadow])
 CITUSAC_PROG_CC_CFLAGS_OPT([-Werror=vla])  # visual studio does not support these
 CITUSAC_PROG_CC_CFLAGS_OPT([-Werror=implicit-int])

src/include/citus_config.h.in

@@ -46,12 +46,12 @@
 /* Define to 1 if you have the `zstd' library (-lzstd). */
 #undef HAVE_LIBZSTD
 
-/* Define to 1 if you have the <memory.h> header file. */
-#undef HAVE_MEMORY_H
-
 /* Define to 1 if you have the <stdint.h> header file. */
 #undef HAVE_STDINT_H
 
+/* Define to 1 if you have the <stdio.h> header file. */
+#undef HAVE_STDIO_H
+
 /* Define to 1 if you have the <stdlib.h> header file. */
 #undef HAVE_STDLIB_H
 
@@ -94,5 +94,7 @@
 /* The size of `void *', as computed by sizeof. */
 #undef SIZEOF_VOID_P
 
-/* Define to 1 if you have the ANSI C header files. */
+/* Define to 1 if all of the C90 standard headers exist (not just the ones
+   required in a freestanding environment). This macro is provided for
+   backward compatibility; new code need not use it. */
 #undef STDC_HEADERS