tests: $(topsrc_dir) -> $(top_srcdir).

Dependencies

• [2] JRVI4XTV tests: Use $(builddir) instead of `pwd`.
• [3] WHS5RMPO
• [4] G2ZB6464 first test, not yet in buildprocess

Change contents

• replacement in tests/Makefile.am at line 4
  [2.102]→[2.102:139](∅→∅)
  − HYDRA_HOME="$(topsrc_dir)/src" \
  [2.102]

  [2.139]
  + HYDRA_HOME="$(top_srcdir)/src" \