Allow dlopen to find libreference-ril.so on 64 bit platform

libreference-ril.so is located in /system/lib64 on 64 bit targets.
The incorrect path caused the ril-daemon to crash, which also blocked
the network on emulator image.

Bug: 16321274
Change-Id: I53a455f51a96de28c8dd0b9e1ffe5b7475b2baf1
diff --git a/rild/rild.c b/rild/rild.c
index 33d25c4..8e479dc 100644
--- a/rild/rild.c
+++ b/rild/rild.c
@@ -175,7 +175,7 @@
         static char   arg_device[32];
         int           done = 0;
 
-#define  REFERENCE_RIL_PATH  "/system/lib/libreference-ril.so"
+#define  REFERENCE_RIL_PATH  "libreference-ril.so"
 
         /* first, read /proc/cmdline into memory */
         char          buffer[1024], *p, *q;