libaio: Remove QA warning: No GNU_HASH in the elf binary

Update the LINK_FLAGS in the Makefile to remove warning:
QA Issue: No GNU_HASH in the elf binary

(From OE-Core rev: 07501f14121a1882f26de66b4ca991392ab45dff)

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Muhammad Shakeel <muhammad_shakeel@mentor.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 6df2a6010882bee92c6af3ef575b4291570623c3)
Merge pull request #10 from drewmoseley/fix-libaio-warning

libaio: Remove QA warning: No GNU_HASH in the elf binary