8266797: Fix for 8266610 breaks the build on macos

Reviewed-by: dholmes, jdv

Author: Vyom Tewari

src/java.base/unix/native/libjava/io_util_md.c

@@ -32,6 +32,9 @@
 
 #if defined(__linux__) || defined(_ALLBSD_SOURCE) || defined(_AIX)
 #include <sys/ioctl.h>
+#endif
+
+#if defined(__linux__)
 #include <linux/fs.h>
 #include <sys/stat.h>
 #endif
@@ -250,14 +253,14 @@ handleGetLength(FD fd)
     if (result < 0) {
         return -1;
     }
-    #ifdef BLKGETSIZE64
+#if defined(__linux__) && defined(BLKGETSIZE64)
     if (S_ISBLK(sb.st_mode)) {
         uint64_t size;
         if(ioctl(fd, BLKGETSIZE64, &size) < 0) {
             return -1;
         }
         return (jlong)size;
     }
-    #endif
+#endif
     return sb.st_size;
 }