Makefile.am: 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: line 64: ^[^/-]*[/-]: No such file or directory
    /bin/bash: line 64: $')\E[m': command not found
    ============================================================================

but is now fixed to look like this:

    ============================================================================
    Testsuite summary for opkbuild 4.2.2-3-gcc09f4e-dirty
    ============================================================================

2 files changed, 9 insertions, 0 deletions

diff --git a/Makefile.am b/Makefile.am
index 3cbf383..f3dbfbc 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -35,6 +35,10 @@ endif
 #   * Our release target
 PACKAGE_STRING = $(PACKAGE_NAME) $(PACKAGE_VERSION_GIT)
 
+# Automake lib/am/check.am since version 1.16.3 defines this with single quotes,
+# which breaks PACKAGE_VERSION_GIT above.
+AM_TESTSUITE_SUMMARY_HEADER = " for $(PACKAGE_STRING)"
+
 SUFFIXES = .sh .sho
 
 SHOBJEXT = sho
diff --git a/NEWS b/NEWS
index 2ea268b..37d7078 100644
--- a/NEWS
+++ b/NEWS
@@ -8,6 +8,11 @@ libopkbuild:
   * ProteanOS source package versions may now contain epochs.  This
     complies with the latest draft of SPF 2.0.
 
+Build system:
+
+  * The test suite summary is fixed, after being broken by GNU Automake
+    since version 1.16.3.
+
 opkbuild version 4.2.2
 ----------------------