Fix implicit declaration of bswap_{32,64}

* src/data.c: Move include of <byteswap.h> ...
* src/lisp.h: ... here.

src/data.c

@@ -23,7 +23,6 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 #include <math.h>
 #include <stdio.h>
 
-#include <byteswap.h>
 #include <count-one-bits.h>
 #include <count-trailing-zeros.h>
 #include <intprops.h>

src/lisp.h

@@ -36,6 +36,7 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 #endif
 
 #include <attribute.h>
+#include <byteswap.h>
 #include <count-leading-zeros.h>
 #include <intprops.h>
 #include <verify.h>