CC and CCX must be set not only for the IgnoreErrors case.
This patch fixes a case when CC is defined in Makefile, because
a value form the environment variable has smaller priority than makefile
definition.
"""
The priority of assignments is from least binding to most binding; the
* precedence of assignments is:
* internal definitions
* environment
* makefile(s)
* command line
"""
This bug was found by Roman Kagan <rkagan@parallels.com>.
Signed-off-by: Andrey Vagin <avagin@openvz.org>