fastboot: correctly set dependency on f2fs dynamic lib

In the past it would incorrectly also link against the dlopen()'d lib.

Now it clearly does not care about it.

ldd $(which fastboot)
        linux-gate.so.1 =>  (0xf7735000)
        libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xf76d9000)
        libstdc++.so.6 => /usr/lib/i386-linux-gnu/libstdc++.so.6 (0xf75f4000)
        libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0xf75c7000)
        libgcc_s.so.1 => /lib/i386-linux-gnu/libgcc_s.so.1 (0xf75a9000)
        libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf73ff000)
        /lib/ld-linux.so.2 (0xf7736000)

Bug: 15717498
Change-Id: I5465e97a445b17f5493a1f590e181ef98a382451
Signed-off-by: JP Abgrall <jpa@google.com>
diff --git a/fastboot/Android.mk b/fastboot/Android.mk
index 5a651f4..0238404 100644
--- a/fastboot/Android.mk
+++ b/fastboot/Android.mk
@@ -66,11 +66,11 @@
 ifeq ($(HOST_OS),linux)
 # libf2fs_dlutils_host will dlopen("libf2fs_fmt_host_dyn")
 LOCAL_CFLAGS += -DUSE_F2FS
-LOCAL_LDLIBS += -ldl
-LOCAL_SHARED_LIBRARIES := libf2fs_fmt_host_dyn
+LOCAL_LDFLAGS += -ldl -rdynamic
+LOCAL_REQUIRED_MODULES := libf2fs_fmt_host_dyn
 # The following libf2fs_* are from system/extras/f2fs_utils,
 # and do not use code in external/f2fs-tools.
-LOCAL_STATIC_LIBRARIES += libf2fs_utils_host libf2fs_dlutils_host
+LOCAL_STATIC_LIBRARIES += libf2fs_utils_host libf2fs_ioutils_host libf2fs_dlutils_host
 endif
 
 include $(BUILD_HOST_EXECUTABLE)