This reverts commit 367ad5055c3d5210c884d4611e08ffa32ec608ee.

This reverts commit 56c311aa0b20dee13ab43309ae3386f57f8cb797.

	Clear runtime dependencies if default gems is specified.

	The current build system uses runtime dependencies from only
	`.bundle` directory. We shouldn't install runtime dependencies
	from rubygems.org when `make test-bundled-gems` is invoked.

	Fixed dependencies list format

	Re-use strscan with ruby repo

This reverts commit 0de1ff12973ffc04bc9a8b0799e963922986d1eb.

	Clear runtime dependencies if default gems is specified.

	The current build system uses runtime dependencies from only
	`.bundle` directory. We shouldn't install runtime dependencies
	from rubygems.org when `make test-bundled-gems` is invoked.

	Fixed dependencies list format

	Re-use strscan with ruby repo

Gemspec files generated by old bundler run `git` without changing the
working directory.
Or some gemspec files expect an owned file at the top exists ath the
current working directory.