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BUILD_URL=https://ci.linaro.org/job/tcwg-abe-test/label=tcwg-x86_64-build,test=testsuite/1572/
EXECUTOR_NUMBER=0
GERRIT_BRANCH=master
GERRIT_CHANGE_COMMIT_MESSAGE=manifest(): Skip packages when using default system version

The loop which iterates over gcc, binutils and ${clibrary} expects the
sources of all these packages to be available so that we can copy
information into the manifest. However, this is not true when building
a single package (eg with --build gcc), leading to spurious error
messages in the logs, such as:

fatal: cannot change to 'default': No such file or directory
fatal: cannot change to 'log': No such file or directory

which happen because 'binutils' is defined to 'default' and 'clibrary'
to 'auto' in global.sh, leading to incorrect definition of srcdir.

This patch explicitly skips 'default' and '' values for srcdir.

Change-Id: I7caaf52f0b727e10fc15a322389062999b9b755f

GERRIT_CHANGE_ID=I7caaf52f0b727e10fc15a322389062999b9b755f
GERRIT_CHANGE_NUMBER=46664
GERRIT_CHANGE_OWNER=\"Christophe Lyon\" <christophe.lyon@linaro.org>
GERRIT_CHANGE_OWNER_EMAIL=christophe.lyon@linaro.org
GERRIT_CHANGE_OWNER_NAME=Christophe Lyon
GERRIT_CHANGE_PRIVATE_STATE=false
GERRIT_CHANGE_SUBJECT=manifest(): Skip packages when using default system version
GERRIT_CHANGE_URL=https://review.linaro.org/c/toolchain/abe/+/46664
GERRIT_CHANGE_WIP_STATE=false
GERRIT_EVENT_ACCOUNT=\"Christophe Lyon\" <christophe.lyon@linaro.org>
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GERRIT_EVENT_ACCOUNT_NAME=Christophe Lyon
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GERRIT_PATCHSET_UPLOADER_NAME=Christophe Lyon
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