xorriso: needs threads and mmu

Fixes (threads):
http://autobuild.buildroot.net/results/c2f/c2fb1cd4e9fe022e152bf6db7d5d819b08d673cd/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/xorriso/Config.in

@@ -3,6 +3,8 @@ config BR2_PACKAGE_XORRISO
 	select BR2_PACKAGE_LIBICONV if !BR2_ENABLE_LOCALE
 	depends on BR2_USE_WCHAR
 	depends on BR2_LARGEFILE
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_USE_MMU # fork()
 	help
 	  xorriso cd/dvd/bd iso 9660 manipulation and disc burner.
 
@@ -17,5 +19,6 @@ config BR2_PACKAGE_XORRISO
 	  http://libburnia-project.org/
 	  http://www.gnu.org/software/xorriso
 
-comment "xorriso needs a toolchain w/ wchar, largefile"
-	depends on !BR2_USE_WCHAR || !BR2_LARGEFILE
+comment "xorriso needs a toolchain w/ wchar, largefile, threads"
+	depends on BR2_USE_MMU
+	depends on !BR2_USE_WCHAR || !BR2_LARGEFILE || !BR2_TOOLCHAIN_HAS_THREADS