my/m4/my_code_coverage.m4: set CODE_COVERAGE_DIRECTORY to $(abs_top_builddir) and use it consistently
my/m4/my_code_coverage.m4: set CODE_COVERAGE_DIRECTORY to $(abs_top_builddir) and use it consistently

farsightsec/mtbl,farsightsec/fstrm,farsightsec/mtbl,farsightsec/fstrm