package/libv4l: v4l-utils need locale

To reproduce the setlocale-related build error use this minimal
defconfig:

BR2_TOOLCHAIN_BUILDROOT_CXX=y
BR2_PACKAGE_LIBV4L=y
BR2_PACKAGE_LIBV4L_UTILS=y

After enabling locale support the build error is fixed:

BR2_TOOLCHAIN_BUILDROOT_LOCALE=y
BR2_TOOLCHAIN_BUILDROOT_CXX=y
BR2_PACKAGE_LIBV4L=y
BR2_PACKAGE_LIBV4L_UTILS=y

Fixes
http://autobuild.buildroot.net/results/f2e/f2e4e34fb14ce355a6e92afc83024b0445f52513/
http://autobuild.buildroot.net/results/fe5/fe56063ddd2232fea7699f5117497beb3deca11e/
http://autobuild.buildroot.net/results/1be/1be55f096ddef2aa38fdba681ed97cf74905477a/



Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>