Refactor ccompile.h to not include system headers

This is a step toward being able to vendor the OpenZFS code in FreeBSD.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Matt Macy <mmacy@FreeBSD.org>
Closes #10625

module/zcommon/zfeature_common.c

@@ -36,6 +36,7 @@
 #include <sys/fs/zfs.h>
 #include <sys/inttypes.h>
 #include <sys/types.h>
+#include <sys/param.h>
 #include <sys/zfs_sysfs.h>
 #include "zfeature_common.h"
 

module/zcommon/zfs_fletcher_avx512.c

@@ -31,7 +31,9 @@
 #include <sys/simd.h>
 #include <zfs_fletcher.h>
 
+#ifdef __linux__
 #define	__asm __asm__ __volatile__
+#endif
 
 static void
 fletcher_4_avx512f_init(fletcher_4_ctx_t *ctx)

module/zcommon/zfs_fletcher_superscalar.c

@@ -41,6 +41,7 @@
  * SOFTWARE.
  */
 
+#include <sys/param.h>
 #include <sys/byteorder.h>
 #include <sys/spa_checksum.h>
 #include <sys/strings.h>

module/zcommon/zfs_fletcher_superscalar4.c

@@ -41,6 +41,7 @@
  * SOFTWARE.
  */
 
+#include <sys/param.h>
 #include <sys/byteorder.h>
 #include <sys/spa_checksum.h>
 #include <sys/strings.h>