Back out \' change for tsearch2, broke regression tests.

contrib/tsearch2/query.c

@@ -748,7 +748,7 @@ infix(INFIX * in, bool first)
 		{
 			if ( t_iseq(op, '\'') )
 			{
-				*(in->cur) = '\'';
+				*(in->cur) = '\\';
 				in->cur++;
 			}
 			COPYCHAR(in->cur,op);

contrib/tsearch2/tsvector.c

@@ -529,7 +529,7 @@ tsvector_out(PG_FUNCTION_ARGS)
 
 				outbuf = (char *) repalloc((void *) outbuf, ++lenbuf);
 				curout = outbuf + pos;
-				*curout++ = '\'';
+				*curout++ = '\\';
 			}
 			while(len--)
 				*curout++ = *curin++;