Support docker for gitian builds

Building with docker is arguably easier and more familiar to most people
than either kvm, or lxc.

This commit also relaxes the back compat requirement a bit. 32 bit linux
now uses glibc version 2.0. Also, the docker shell could not handle gcc arguments
containing spaces, so the explicit '-DFELT_TYPE' declaration was dropped.

Lastly, this removes some packages from the osx descriptor.

1 files changed, 1 insertions, 1 deletions

diff --git a/contrib/gitian/gitian-build.py b/contrib/gitian/gitian-build.py
index df1ba0d6b..cd88ecb20 100755
--- a/contrib/gitian/gitian-build.py
+++ b/contrib/gitian/gitian-build.py
@@ -116,7 +116,7 @@ def main():
     parser.add_argument('-D', '--detach-sign', action='store_true', dest='detach_sign', help='Create the assert file for detached signing. Will not commit anything.')
     parser.add_argument('-n', '--no-commit', action='store_false', dest='commit_files', help='Do not commit anything to git')
     parser.add_argument('signer', help='GPG signer to sign each build assert file')
-    parser.add_argument('version', help='Version number, commit, or branch to build. If building a commit or branch, the -c option must be specified')
+    parser.add_argument('version', help='Version number, commit, or branch to build.')
 
     args = parser.parse_args()
     workdir = os.getcwd()