lapd_test.c: Convert compilation warning to level message

This way we clean the build of warnings completely and we can enable
-Werror but we still see this FIXME message while compiling.

Change-Id: I24c11226cd5bb5b6032f4ece7d1a0695dc82f0dd
diff --git a/tests/lapd/lapd_test.c b/tests/lapd/lapd_test.c
index e322314..0dccaa4 100644
--- a/tests/lapd/lapd_test.c
+++ b/tests/lapd/lapd_test.c
@@ -358,7 +358,7 @@
 
 		/* Verify the added RSL_IE_L3_INFO but we have a bug here */
 		OSMO_ASSERT(msg->data[6] == RSL_IE_L3_INFO);
-		#warning "RSL_IE_L3_INFO 16 bit length is wrong"
+		#pragma message ("RSL_IE_L3_INFO 16 bit length is wrong")
 		/* This should be okay but it is actually 0x0, 0x9c on ia-32 */
 		/* OSMO_ASSERT(msg->data[7] == 0x0 && msg->data[8] == 0x0); */
 	} else if (state->ms_read == 1) {