eal/linux: improve musl compatibility

When built against musl, fcntl.h doesn't silently get included.
Fix by including it explicitly.

Bugzilla ID: 33

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>

lib/librte_eal/linuxapp/eal/eal_hugepage_info.c

@@ -6,6 +6,7 @@
 #include <sys/types.h>
 #include <sys/file.h>
 #include <dirent.h>
+#include <fcntl.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <stdio.h>