tests: Fix linker failure for fdc-test

When QEMU was built with the simple trace backend, linking failed:

  LINK  tests/fdc-test
oslib-posix.o: In function `trace_qemu_memalign':
qemu/bin/debug/x86/./trace.h:31: undefined reference to `trace3'
oslib-posix.o: In function `trace_qemu_vmalloc':
qemu/bin/debug/x86/./trace.h:35: undefined reference to `trace2'
oslib-posix.o: In function `trace_qemu_vfree':
qemu/bin/debug/x86/./trace.h:39: undefined reference to `trace1'
collect2: error: ld returned 1 exit status
make: *** [tests/fdc-test] Fehler 1
Signed-off-by: NStefan Weil <sw@weilnetz.de>
Reviewed-by: NKevin Wolf <kwolf@redhat.com>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

tests/Makefile

@@ -68,7 +68,7 @@ tests/test-qmp-commands$(EXESUF): tests/test-qmp-commands.o tests/test-qmp-marsh
 
 tests/rtc-test$(EXESUF): tests/rtc-test.o $(trace-obj-y)
 tests/m48t59-test$(EXESUF): tests/m48t59-test.o $(trace-obj-y)
-tests/fdc-test$(EXESUF): tests/fdc-test.o tests/libqtest.o
+tests/fdc-test$(EXESUF): tests/fdc-test.o tests/libqtest.o $(trace-obj-y)
 
 # QTest rules