cvsimport: avoid "use" with :tag

Avoid "use POSIX qw(strftime dup2 :errno_h)"; it was reported
that a Perl installations on Mandrake 9.1 did not like it, even
though it understood "use POSIX qw(:errno_h)".  Funny.

Signed-off-by: Junio C Hamano <junkio@cox.net>

git-cvsimport.perl

@@ -23,7 +23,7 @@
 use Time::Local;
 use IO::Socket;
 use IO::Pipe;
-use POSIX qw(strftime dup2 :errno_h);
+use POSIX qw(strftime dup2 ENOENT);
 use IPC::Open2;
 
 $SIG{'PIPE'}="IGNORE";