Transceiver52M: Fix SSE preprocessor definition

Using non-SSE4.1 enabled architecture would cause undefined
reference to 'convert_si16_ps' call.

Signed-off-by: Thomas Tsou <tom@tsou.cc>
diff --git a/Transceiver52M/x86/convert.c b/Transceiver52M/x86/convert.c
index 1d2f208..40831da 100644
--- a/Transceiver52M/x86/convert.c
+++ b/Transceiver52M/x86/convert.c
@@ -165,7 +165,7 @@
 }
 #endif
 
-#ifndef HAVE_SSE3
+#ifndef HAVE_SSE4_1
 static void convert_si16_ps(float *out, short *in, int len)
 {
 	for (int i = 0; i < len; i++)