Set Trilinos_SHOW_GIT_COMMIT_PARENTS=ON for all GenConfig PR builds (T…

…riBITSPub/TriBITS#597)

This is needed to know the versions of the target and topic branches for PR
builds submitted to CDash.  This is needed to be able to detect random test
failures.

packages/framework/ini-files/config-specs.ini

@@ -301,6 +301,8 @@ opt-set-cmake-var CMAKE_GENERATOR STRING : Ninja
 
 opt-set-cmake-var Trilinos_PARALLEL_LINK_JOBS_LIMIT STRING : 8
 
+opt-set-cmake-var Trilinos_SHOW_GIT_COMMIT_PARENTS BOOL : ON
+
 # Misc options typically added by CI testing mode in TriBITS
 opt-set-cmake-var Trilinos_ENABLE_ALL_OPTIONAL_PACKAGES BOOL : ON
 opt-set-cmake-var Trilinos_ALLOW_NO_PACKAGES BOOL : ON