package/nano: fix tiny build

package/nano: fix tiny build

Since upstream commit
https://git.savannah.gnu.org/cgit/nano.git/commit/configure.ac?id=235f92ce093099cd81f14827ab842bd331132790

--enable-color --enable-nanorc are needed for libmagic support in tiny
builds however as --enable-color needs fork() and tiny is selected when
!BR2_USE_MMU, it is easier to just disable libmagic with tiny builds

Add explicit options to enable tiny, libmagic, color, and nanorc, rather
than relying on defaults.

Fixes:
 - http://autobuild.buildroot.net/results/24894e62d6cf89d078959b12e67596c821d64696

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[yann.morin.1998@free.fr: add explicit options]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>