Locate endian header on Solaris

Author: nealrichardson

include/fast_float/float_common.h

@@ -32,6 +32,8 @@
 #else
 #if defined(__APPLE__) || defined(__FreeBSD__)
 #include <machine/endian.h>
+#elif defined(sun) || defined(__sun)
+#include <sys/byteorder.h>
 #else
 #include <endian.h>
 #endif
@@ -337,4 +339,4 @@ inline OStream& operator<<(OStream &out, const fast_float::decimal &d) {
   return out;
 }
 
-#endif
+#endif