Remove duplicate item to avoid compiling error

The gcc 4.5 complains about the duplicate item:

external/svox/pico/lib/picosig2.c: In function 'sigAllocate':
external/svox/pico/lib/picosig2.c:75:26: error: operation on 'sig_inObj->int_vec38' may be undefined

Change-Id: I4532b770ff02e058253ed01cbed50b0efb8a83ce
diff --git a/pico/lib/picosig2.c b/pico/lib/picosig2.c
index 11a606a..c2a69cc 100644
--- a/pico/lib/picosig2.c
+++ b/pico/lib/picosig2.c
@@ -72,7 +72,6 @@
     sig_inObj->int_vec26 =
     sig_inObj->int_vec28 =
     sig_inObj->int_vec29 =
-    sig_inObj->int_vec38 =
     sig_inObj->int_vec30 =
     sig_inObj->int_vec31 =
     sig_inObj->int_vec32 =