Unify solaris_i386 and solaris_sparc templates. They were almost identical

anyway, the rest being due to them not being kept in sync.  Add configure
test for lorder and use it (on Solaris) when found.

src/include/port/solaris.h

@@ -0,0 +1,64 @@
+/* $Header: /cvsroot/pgsql/src/include/port/solaris.h,v 1.1 2000/10/10 21:22:26 petere Exp $ */
+
+#define USE_POSIX_TIME
+#define NO_EMPTY_STMTS
+#define SYSV_DIRENT
+#define HAS_TEST_AND_SET
+typedef unsigned char slock_t;
+
+/*
+ * Sort this out for all operting systems some time.  The __xxx
+ * symbols are defined on both GCC and Solaris CC, although GCC
+ * doesn't document them.  The __xxx__ symbols are only on GCC.
+ */
+#if defined(__i386) && !defined(__i386__)
+# define __i386__
+#endif
+
+#if defined(__sparc) && !defined(__sparc__)
+# define __sparc__
+#endif
+
+#if defined(__i386__)
+# include <sys/isa_defs.h>
+#endif
+
+#ifndef			BIG_ENDIAN
+#define			BIG_ENDIAN		4321
+#endif
+#ifndef			LITTLE_ENDIAN
+#define			LITTLE_ENDIAN	1234
+#endif
+#ifndef			PDP_ENDIAN
+#define			PDP_ENDIAN		3412
+#endif
+
+#ifndef			BYTE_ORDER
+# ifdef __sparc__
+#  define		BYTE_ORDER		BIG_ENDIAN
+# endif
+# ifdef __i386__
+#   define		BYTE_ORDER		LITTLE_ENDIAN
+# endif
+#endif
+
+
+#ifndef	NAN
+
+# if defined(__GNUC__) && defined(__i386__)
+
+#  ifndef __nan_bytes
+#   define __nan_bytes				{ 0, 0, 0, 0, 0, 0, 0xf8, 0x7f }
+#  endif
+
+#  define NAN \
+	(__extension__ ((union { unsigned char __c[8]; double __d; }) \
+					{ __nan_bytes }).__d)
+
+# else /* not GNUC and i386 */
+
+#  define NAN (0.0/0.0)
+
+# endif /* GCC.  */
+
+#endif	 /* not NAN */