Fix OpenBSD build of the updated kaitai runtime

Author: NikolajSchlej

common/kaitai/kaitaistream.cpp

@@ -12,6 +12,7 @@
 #define __BYTE_ORDER    BYTE_ORDER
 #define __BIG_ENDIAN    BIG_ENDIAN
 #define __LITTLE_ENDIAN LITTLE_ENDIAN
+// UEFITool: add MinGW
 #elif defined(_MSC_VER) || defined(__MINGW32__)
 #include <stdlib.h>
 #define __LITTLE_ENDIAN     1234
@@ -32,7 +33,13 @@
 #else
 // At this point it's either Linux or BSD. Both have "sys/param.h", so it's safe to include
 #include <sys/param.h> // `BSD` macro  // IWYU pragma: keep
-#if defined(BSD)
+// UEFITool: add special case of OpenBSD
+#if defined(__OpenBSD__)
+#include <endian.h>
+#define bswap_16(x) swap16(x)
+#define bswap_32(x) swap32(x)
+#define bswap_64(x) swap64(x)
+#elif defined(BSD)
 // Supposed to work on FreeBSD: https://man.freebsd.org/cgi/man.cgi?query=bswap16&manpath=FreeBSD+14.0-RELEASE
 // Supposed to work on NetBSD: https://man.netbsd.org/NetBSD-10.0/bswap16.3
 #include <sys/endian.h>