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Merge pull request #540 from daid/patch-1

Make the local variables of getopt static.

--- a/src/extern/getopt.c

+++ b/src/extern/getopt.c

@@ -31,7 +31,7 @@

 #include <string.h>

 #include "extern/getopt.h"

-int __optpos, __optreset;

+static int __optpos, __optreset;

 void musl__getopt_msg(const char *a, const char *b, const char *c, size_t l)

 {