Merge branch 'az/tighten-string-array-constness'

Code clean-up.

* az/tighten-string-array-constness:
  global: mark usage strings and string tables const

builtin/fast-export.c

@@ -30,7 +30,7 @@
 #include "remote.h"
 #include "blob.h"
 
-static const char *fast_export_usage[] = {
+static const char *const fast_export_usage[] = {
 	N_("git fast-export [<rev-list-opts>]"),
 	NULL
 };