Sync with 2.4.9

Documentation/RelNotes/2.2.3.txt

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+Git v2.2.3 Release Notes
+========================
+
+Fixes since v2.2.2
+------------------
+
+ * A handful of codepaths that used to use fixed-sized arrays to hold
+   pathnames have been corrected to use strbuf and other mechanisms to
+   allow longer pathnames without fearing overflows.

Documentation/RelNotes/2.3.9.txt

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+Git v2.3.9 Release Notes
+========================
+
+Fixes since v2.3.8
+------------------
+
+ * A handful of codepaths that used to use fixed-sized arrays to hold
+   pathnames have been corrected to use strbuf and other mechanisms to
+   allow longer pathnames without fearing overflows.

Documentation/RelNotes/2.4.9.txt

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+Git v2.4.9 Release Notes
+========================
+
+Fixes since v2.4.9
+------------------
+
+ * A handful of codepaths that used to use fixed-sized arrays to hold
+   pathnames have been corrected to use strbuf and other mechanisms to
+   allow longer pathnames without fearing overflows.