poky-tiny: Fix qemu build failure

poky-tiny: Fix qemu build failure

qemu-native shows:

| ERROR: User requested feature sdl
|        configure was not able to find it.
|        Install SDL devel
|

and from config.log, it shows:

pokybuild@ubuntu1404:~/yocto-autobuilder/yocto-worker/poky-tiny/build/build/tmp/work/x86_64-linux/qemu-native/2.1.0-r0/qemu-2.1.0$ gcc -fPIE -DPIE -m64 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common -isystem/home/pokybuild/yocto-autobuilder/yocto-worker/poky-tiny/build/build/tmp/sysroots/x86_64-linux/usr/include -O2 -pipe -Wendif-labels -Wmissing-include-dirs -Wempty-body -Wnested-externs -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers -Wold-style-declaration -Wold-style-definition -Wtype-limits -fstack-protector-all -D_GNU_SOURCE=1 -D_REENTRANT -I/usr/include/SDL -o config-temp/qemu-conf.exe config-temp/qemu-conf.c -Wl,-z,relro -Wl,-z,now -pie -m64 -g -L/home/pokybuild/yocto-autobuilder/yocto-worker/poky-tiny/build/build/tmp/sysroots/x86_64-linux/usr/lib -L/home/pokybuild/yocto-autobuilder/yocto-worker/poky-tiny/build/build/tmp/sysroots/x86_64-linux/lib -Wl,-rpath-link,/home/pokybuild/yocto-autobuilder/yocto-worker/poky-tiny/build/build/tmp/sysroots/x86_64-linux/usr/lib -Wl,-rpath-link,/home/pokybuild/yocto-autobuilder/yocto-worker/poky-tiny/build/build/tmp/sysroots/x86_64-linux/lib -Wl,-rpath,/home/pokybuild/yocto-autobuilder/yocto-worker/poky-tiny/build/build/tmp/sysroots/x86_64-linux/usr/lib -Wl,-rpath,/home/pokybuild/yocto-autobuilder/yocto-worker/poky-tiny/build/build/tmp/sysroots/x86_64-linux/lib -Wl,-O1 -L/usr/lib/x86_64-linux-gnu -lSDL
//lib/x86_64-linux-gnu/libncursesw.so.5: undefined reference to `_nc_putchar'
collect2: error: ld returned 1 exit status

Enabling widec for ncurses-native should resolve this.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>