git: update to v2.8.2

Update to git version v2.8.2.

* Upstream commit 1a0c8dfd89475d6bb09ddee8c019cf0ae5b3bdc2 (strbuf: give
  strbuf_getline() to the "most text friendly" variant) changed API.

Signed-off-by: Christian Hesse <mail@eworm.de>
diff --git a/scan-tree.c b/scan-tree.c
index 2e87999..1cb4e5d 100644
--- a/scan-tree.c
+++ b/scan-tree.c
@@ -246,7 +246,7 @@
 			projectsfile, strerror(errno), errno);
 		return;
 	}
-	while (strbuf_getline(&line, projects, '\n') != EOF) {
+	while (strbuf_getline(&line, projects) != EOF) {
 		if (!line.len)
 			continue;
 		strbuf_insert(&line, 0, "/", 1);