package/libftdi1: fix static build with libusb and -latomic

Use pkg-config to retrieve libusb dependencies such as -latomic and
avoid the following static build failure raised since bump of libusb to
version 1.0.25 in commit aad60993:

/nvmedata/autobuild/instance-29/output-1/per-package/libftdi1/host/bin/../lib/gcc/sparc-buildroot-linux-uclibc/10.3.0/../../../../sparc-buildroot-linux-uclibc/bin/ld: /nvmedata/autobuild/instance-29/output-1/per-package/libftdi1/host/sparc-buildroot-linux-uclibc/sysroot/lib/libusb-1.0.a(core.o): in function `libusb_unref_device':
/nvmedata/autobuild/instance-29/output-1/build/libusb-1.0.25/libusb/core.c:1186: undefined reference to `__atomic_fetch_add_4'

Fixes:
 - http://autobuild.buildroot.org/results/1ca7cd85ae60ad4797a6d8a83b2fb51d7eab96d9



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>