oskar commands should be invocable in any path

[ObiWahn]

obey@ulf ~/A/r/o/w/build-documentation> buildStaticArangoDB
<E> fish: getcwd() failed with errno 2/No such file or directory
Set cache size limit to 30.0 GB
cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_CXX_COMPILER=/usr/lib/ccache/bin/g++ -DCMAKE_C_COMPILER=/usr/lib/ccache/bin/gcc -DUSE_MAINTAINER_MODE=On -DUSE_ENTERPRISE=On -DUSE_JEMALLOC=On -DCMAKE_INSTALL_PREFIX=/ -DSTATIC_EXECUTABLES=On -DCMAKE_EXE_LINKER_FLAGS=-Wl,--build-id -no-pie ..                                                                                         
cmake output in work/cmakeArangoDB.log
^C<E> fish: getcwd() failed with errno 2/No such file or directory