tests: fix tests build (LDFLAGS_GNUHASH not longer defined)
tests: fix tests build (LDFLAGS_GNUHASH not longer defined)

Since commit a899b909, variable LDFLAGS_GNUHASH has been replaced
by CFLAG_-Wl--hash-style=gnu. This change has not been reported to
the tests buildsys.

Signed-off-by: Carmelo Amoroso <532378793705a04edd56deb76ad8c0442834d55d@st.com>

mephi42/uClibc,waweber/uclibc-clang,ffainelli/uClibc,waweber/uclibc-clang,czankel/xtensa-uclibc,majek/uclibc-vx32,groundwater/uClibc,kraj/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,kraj/uClibc,skristiansson/uClibc-or1k,kraj/uclibc-ng,groundwater/uClibc,kraj/uClibc,czankel/xtensa-uclibc,ffainelli/uClibc,ddcc/klee-uclibc-0.9.33.2,kraj/uclibc-ng,skristiansson/uClibc-or1k,foss-for-synopsys-dwc-arc-processors/uClibc,hwoarang/uClibc,hwoarang/uClibc,waweber/uclibc-clang,hwoarang/uClibc,mephi42/uClibc,skristiansson/uClibc-or1k,foss-xtensa/uClibc,majek/uclibc-vx32,waweber/uclibc-clang,majek/uclibc-vx32,wbx-github/uclibc-ng,brgl/uclibc-ng,hjl-tools/uClibc,wbx-github/uclibc-ng,majek/uclibc-vx32,hjl-tools/uClibc,hjl-tools/uClibc,ddcc/klee-uclibc-0.9.33.2,wbx-github/uclibc-ng,ffainelli/uClibc,mephi42/uClibc,hjl-tools/uClibc,groundwater/uClibc,ffainelli/uClibc,kraj/uclibc-ng,ddcc/klee-uclibc-0.9.33.2,brgl/uclibc-ng,groundwater/uClibc,foss-xtensa/uClibc,hjl-tools/uClibc,groundwater/uClibc,ddcc/klee-uclibc-0.9.33.2,foss-xtensa/uClibc,kraj/uclibc-ng,wbx-github/uclibc-ng,brgl/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,foss-xtensa/uClibc,brgl/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,mephi42/uClibc,czankel/xtensa-uclibc,ffainelli/uClibc,hwoarang/uClibc,czankel/xtensa-uclibc,kraj/uClibc,skristiansson/uClibc-or1k