libostree: fix cross and musl builds

srcpkgs/libostree/patches/musl-fixes.patch

@@ -0,0 +1,20 @@
+--- src/libostree/ostree-repo.c
++++ src/libostree/ostree-repo.c
+@@ -42,6 +42,7 @@
+
+ #include <locale.h>
+ #include <glib/gstdio.h>
++#include <sys/file.h>
+
+ /**
+  * SECTION:ostree-repo
+--- src/libostree/ostree-sysroot.c
++++ src/libostree/ostree-sysroot.c
+@@ -21,6 +21,7 @@
+ #include "config.h"
+
+ #include "otutil.h"
++#include <sys/file.h>
+ #include <sys/mount.h>
+ #include <sys/wait.h>
+

srcpkgs/libostree/template

@@ -4,7 +4,7 @@ version=2017.3
 revision=1
 build_style=gnu-configure
 configure_args="--with-builtin-grub2-mkconfig --with-openssl"
-hostmakedepends="bison libxslt pkg-config"
+hostmakedepends="bison libxslt pkg-config glib-devel"
 makedepends="e2fsprogs-devel fuse-devel glib-devel gpgme-devel libarchive-devel
  liblzma-devel libressl-devel libsoup-devel"
 short_desc="Operating system and container binary deployment and upgrades"