[e]glibc-package.inc: fix multiple providers for glibc-gconv-iso8859-1
This commit fixes the following error while doing this:
bitbake poky-image-sato
ERROR: Conflicting PREFERRED_PROVIDER entries were found which resulted in an attempt to select multiple providers (['virtual:nativesdk:/distro/dcui/dexuan/meta/recipes-core/eglibc/eglibc_2.12.bb', '/distro/dcui/dexuan/meta/recipes-core/eglibc/eglibc_2.12.bb']) for runtime dependency glibc-gconv-iso8859-1 The entries resulting in this conflict were: ['PREFERRED_PROVIDER_virtual/libc-nativesdk = eglibc-nativesdk', 'PREFERRED_PROVIDER_virtual/libc = eglibc']
NOTE: multiple providers are available for runtime glibc-gconv-iso8859-1 (eglibc, eglibc-nativesdk, glibc-nativesdk, glibc, external-csl-toolchain, external-poky-toolchain)
NOTE: consider defining a PREFERRED_PROVIDER entry to match glibc-gconv-iso8859-1
