games/tome4: add MAKE_JOBS_UNSAFE=yes

I'm hitting race condition on powerpc64 with 32 threads:

Building TEngine (release)

Creating ../obj/Release/TEngine
noise.c
cc -O2 -pipe -fstack-protector-all -fno-strict-aliasing -std=gnu89 -MMD -MP -DGLEW_STATIC -DNDEBUG=1 -D_DEFAULT_VIDEOMODE_FLAGS_='SDL_HWSURFACE|SDL_DOUBLEBUF' -DTENGINE_HOME_PATH='".t-engine"' -DTE4CORE_VERSION=17 -DSELFEXE_BSD -I../src -I../src/luasocket -I../src/fov -I../src/expat -I../src/lxp -I../src/libtcod_import -I../src/physfs -I../src/zlib -I../src/bzip2 -I../src/luajit2/src -I../src/luajit2/dynasm -I/usr/local/include -pthread -o "../obj/Release/TEngine/noise.o" -MF ../obj/Release/TEngine/noise.d -c "../src/noise.c"
mkdir -p ../obj/Release/TEngine
error: unable to open output file '../obj/Release/TEngine/noise.o': 'No such file or directory'
1 error generated.
core_lua.c
SFMT.c
serial.c

PR: 242556
Approved by: lifanov (maintainer timeout)