Make us_ascii_mbc_enc_len() static

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Index: …/enc/us_ascii.c

— …/enc/us_ascii.c (revision 19925)
+++ …/enc/us_ascii.c (working copy)
@@ -1,6 +1,6 @@
#include “regenc.h”

-extern int
+static int
us_ascii_mbc_enc_len(const UChar* p, const UChar* e, OnigEncoding enc)
{
if (*p & 0x80)