bionic libs test: clean up for gethostname test

since the tests for gethostname will be migrated into
bionic/tests/unistd_test.cpp as unistd.gethostname test
in the gtest format, the related files and settings will
be cleaned up here.

Change-Id: Ibe2bc9d3304ec9ac08a24a318276f07b84a1afea
Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>
2 files changed