LD_LIBRARY_PATH needs to be exported for Linux

[nishtahir]

Running into this problem on Linux

yosys -q -p 'synth_ice40 -top Top -json ../build/out.json' ../rtl/*.sv alchitry_cu/*.sv
yosys: error while loading shared libraries: libtcl8.6.so: cannot open shared object file: No such file or directory

Workaround is to manually export the LD_LIBRARY_PATH

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:~/.icicle/toolchains/2022-07-12/oss-cad-suite/lib