cvsimport: standarize system() calls to external git tools

This patch standardizes calls to system() where external git tools are
called.  Instead of system("git foo ... "), use system(qw(git foo ...)).
All calls are made without the use of an 'sh -c' process to split the
arguments.

Signed-off-by: Ben Walton <bwalton@artsci.utoronto.ca>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-cvsimport.perl

@@ -609,9 +609,9 @@ sub munge_user_filename {
 my %index; # holds filenames of one index per branch
 
 unless (-d $git_dir) {
-	system("git init");
+	system(qw(git init));
 	die "Cannot init the GIT db at $git_tree: $?\n" if $?;
-	system("git read-tree");
+	system(qw(git read-tree));
 	die "Cannot init an empty tree: $?\n" if $?;
 
 	$last_branch = $opt_o;
@@ -993,7 +993,7 @@ sub commit {
 		}
 		commit();
 		if (($commitcount & 1023) == 0) {
-			system("git repack -a -d");
+			system(qw(git repack -a -d));
 		}
 		$state = 1;
 	} elsif ($state == 11 and /^-+$/) {
@@ -1017,7 +1017,7 @@ sub commit {
 if ($line =~ /^(\d+) objects, (\d+) kilobytes$/) {
   my ($n_objects, $kb) = ($1, $2);
   1024 < $kb
-    and system("git repack -a -d");
+    and system(qw(git repack -a -d));
 }
 
 foreach my $git_index (values %index) {
@@ -1059,7 +1059,7 @@ sub commit {
 		if ($opt_r && $opt_o ne 'HEAD');
 	system('git', 'update-ref', 'HEAD', "$orig_branch");
 	unless ($opt_i) {
-		system('git checkout -f');
+		system(qw(git checkout -f));
 		die "checkout failed: $?\n" if $?;
 	}
 }