pymca is marked for autoremoval from testing

[Debian testing autoremoval watch]

pymca 5.4.0+dfsg-1 is marked for autoremoval from testing on 2019-01-22

It (build-)depends on packages with these RC bugs:
916024: pocl: pocl FTBFS: symbol differences
917244: pocl: FTBFS on armel: clang: error: the clang compiler does not support '-march=arm946e-s'
917722: pybind11: FTBFS: dh_auto_test: cd obj-x86_64-linux-gnu && make -j2 check ARGS\+=-j2 returned exit code 2