build: Automake broke the test suite summary

Because of this in our Makefile.am:

    PACKAGE_VERSION_GIT = $$(git describe --tags --dirty | sed 's|^[^/-]*[/-]||')
    PACKAGE_STRING = $(PACKAGE_NAME) $(PACKAGE_VERSION_GIT)

and this in Automake lib/am/check.am since version 1.16.3:

    AM_TESTSUITE_SUMMARY_HEADER = ' for $(PACKAGE_STRING)'

the test suite summary header came out like this:

    /bin/bash: -c: line 64: syntax error near unexpected token `('
    /bin/bash: -c: line 64: `echo "${col}Testsuite summary"' for @ 1.0.0$(printf ' (%s)' "$({ git describe --tags --dirty 2>/dev/null || printf '%s-g%s' "$(git rev-list --count HEAD)" "$(git describe --tags --dirty --always)"; } | sed 's|^.*/||')")'"${std}";	\'

but is now fixed to look like this:

    ============================================================================
    Testsuite summary for @ 1.0.0 (93-g86a7f46-dirty)
    ============================================================================

0 files changed, 0 insertions, 0 deletions