bash: ptest dependency on locale should honor virtual/libc-locale
meta/conf/distro/include/tclibc-glibc.inc weakly assigns PREFERRED_PROVIDER
for virtual/libc-locale to glibc-locale, but allows adjusting it if needed.
Hence, bash should not depend on glibc-locale directly, but instead use this
virtual/libc-locale variable.
Signed-off-by: Denys Dmytriyenko <denys@ti.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>