Fix (and make consistent) the use of OpenBSD preprocessor macro tests

Prior to this commit, the testsuite was failing on OpenBSD.  After
this commit the testsuite runs fine on OpenBSD.

It was previously decided to test for the OpenBSD macro (rather than
__OpenBSD__, etc.) because OpenBSD forks seem to have the former
macro defined.  sys/param.h must be included for the OpenBSD macro
definition; however, many files tested for the OpenBSD macro without
having this header included.

This commit includes sys/param.h in the files where the OpenBSD macro
is used (and sys/param.h is not already included), and it also
changes some instances of the __OpenBSD__ macro to OpenBSD.

See commit 27df23abb675ffeb198bf0c1cc85c4baed77a988 which changed
everything to use OpenBSD instead of __OpenBSD__ or OPENBSD.  See
also tickets #6982 and #20980 (the latter ticket is where it was
decided to use the OpenBSD macro).

Signed-off-by: Kris Katterjohn <katterjohn@gmail.com>

src/app/config/config.c

@@ -131,6 +131,9 @@
 #ifdef HAVE_SYS_STAT_H
 #include <sys/stat.h>
 #endif
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif

src/core/or/connection_edge.c

@@ -139,6 +139,9 @@
 #ifdef HAVE_SYS_IOCTL_H
 #include <sys/ioctl.h>
 #endif
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
 
 #if defined(HAVE_NET_IF_H) && defined(HAVE_NET_PFVAR_H)
 #include <net/if.h>

src/ext/byteorder.h

@@ -29,6 +29,10 @@
     Jean-Philippe Aumasson (https://131002.net/siphash/siphash24.c)
 */
 
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+
 /* This code is extracted from csiphash.h */
 
 #if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) &&      \

src/ext/ed25519/donna/ed25519-donna-portable-identify.h

@@ -14,7 +14,7 @@
 			#define OS_OSX
 		#elif defined(macintosh) || defined(Macintosh)
 			#define OS_MAC
-		#elif defined(__OpenBSD__)
+		#elif defined(OpenBSD)
 			#define OS_OPENBSD
 		#endif
 	#endif

src/ext/trunnel/trunnel.c

@@ -14,6 +14,10 @@
 #include <stdlib.h>
 #include <string.h>
 
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+
 #if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && \
 	__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
 #  define IS_LITTLE_ENDIAN 1
@@ -31,7 +35,7 @@
 #    define IS_LITTLE_ENDIAN
 #  endif
 #else
-# if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
+# if defined(__FreeBSD__) || defined(__NetBSD__) || defined(OpenBSD)
 #  include <sys/endian.h>
 # else
 #  include <endian.h>

src/lib/err/backtrace.c

@@ -32,6 +32,9 @@
 #ifdef HAVE_SIGNAL_H
 #include <signal.h>
 #endif
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>

src/lib/net/inaddr_st.h

@@ -28,6 +28,9 @@
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
 
 #ifdef _WIN32
 #include <winsock2.h>
@@ -60,7 +63,7 @@ struct in6_addr
 /** @{ */
 /** Many BSD variants seem not to define these. */
 #if defined(__APPLE__) || defined(__darwin__) || \
-  defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
+  defined(__FreeBSD__) || defined(__NetBSD__) || defined(OpenBSD)
 #ifndef s6_addr16
 #define s6_addr16 __u6_addr.__u6_addr16
 #endif

src/test/test-memwipe.c

@@ -12,6 +12,10 @@
 #include <sys/types.h>
 #include <stdlib.h>
 
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+
 static unsigned fill_a_buffer_memset(void) __attribute__((noinline));
 static unsigned fill_a_buffer_memwipe(void) __attribute__((noinline));
 static unsigned fill_a_buffer_nothing(void) __attribute__((noinline));

src/test/test_options.c

@@ -23,6 +23,10 @@
 #include "test/test_helpers.h"
 #include "lib/net/resolve.h"
 
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+
 #define NS_MODULE test_options
 
 typedef struct {