[PATCH] convert local constant arrays to static

[Denis Vlasenko]

Hello,

Patch basically does this:

-               char *extn[] = {"", ".zip", ".ZIP"};
+               static const char *const extn[] = {"", ".zip", ".ZIP"};

in several places. '*const' pointers are used instead
of just '*' to let compiler check that there is no
assignments to array members.

Rob, can you look at the hunk where I made cleanenv[]
static? I'm not 100% sure it's ok to do so...

A few small unrelated fixes are also there.
--
vda
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