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fix shell escape for rc (thanks shurizzle)

--- a/misc2.c

+++ b/misc2.c

@@ -1265,7 +1265,11 @@

 	else

 # endif

 	if (*p == '\'')

+# ifdef PLAN9

+	    length += 1;		/* ' => '' */

+# else

 	    length += 3;		/* ' => '\'' */

+# endif

     }

     /* Allocate memory for the result and fill it. */

@@ -1300,8 +1304,10 @@

 	    if (*p == '\'')

 	    {

 		*d++='\'';

+# ifndef PLAN9

 		*d++='\\';

 		*d++='\'';

+# endif

 		*d++='\'';

 		++p;

 		continue;