Compile the luajit binary dynamically against the luajit library

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Index: b/src/Makefile
===================================================================
--- a/src/Makefile
+++ b/src/Makefile
@@ -669,7 +669,7 @@
 
 $(LUAJIT_T): $(TARGET_O) $(LUAJIT_O) $(TARGET_DEP)
 	$(E) "LINK      $@"
-	$(Q)$(TARGET_LD) $(TARGET_ALDFLAGS) -o $@ $(LUAJIT_O) $(TARGET_O) $(TARGET_ALIBS)
+	$(Q)$(TARGET_LD) $(TARGET_ALDFLAGS) -o $@ $(LUAJIT_O) -lluajit -L. $(TARGET_ALIBS)
 	$(Q)$(TARGET_STRIP) $@
 	$(E) "OK        Successfully built LuaJIT"