USE_SYSTEM_COZ=1 make bench

[letac]

USE_SYSTEM_COZ=1 make bench don't work.

[pbzip2] Compiling pbzip2.cpp 
pbzip2.cpp:290:10: fatal error: coz.h: No such file or directory
 #include "coz.h"
          ^~~~~~~
compilation terminated.
make: *** [../../common.mk:71: obj/pbzip2.o] Error 1

[pca] Running benchmark on large input 
/home/strale/.nix-profile/bin/coz run  --- ./pca > /dev/null
ERROR: ld.so: object '/nix/store/j7d2caqwfll8snf8fr4hf42zqf0w0qzy-coz-0.2.0/bin/libcoz/libcoz.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.

In second example it gets '/nix/store/j7d2caqwfll8snf8fr4hf42zqf0w0qzy-coz-0.2.0/bin/libcoz/libcoz.so', and not '/nix/store/j7d2caqwfll8snf8fr4hf42zqf0w0qzy-coz-0.2.0/libcoz/libcoz.so'