package/ltp-testsuite: remove ldd command test with static only build

package/ltp-testsuite: remove ldd command test with static only build

ldd command build system try to build a shared library unconditionally:

arc-linux-gcc -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -matomic -Os -static \
	-I[...]/sysroot/usr/include/tirpc   -g -O2 -fno-strict-aliasing -pipe \
	-Wall -W -Wold-style-definition -shared -o lddfile1.obj.so lddfile1.o

Fixes:
http://autobuild.buildroot.net/results/2ec/2eccf9f517ab15d8d459b06195423fdfe3fba9fa

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>