perf/run: add calls to get_var_from_env_or_config()

These calls make it possible to have the make command or the
make options in a config file, instead of in environment
variables.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/perf/run

@@ -116,6 +116,9 @@ export GIT_PERF_REPEAT_COUNT
 get_var_from_env_or_config "GIT_PERF_DIRS_OR_REVS" "perf.dirsOrRevs"
 set -- $GIT_PERF_DIRS_OR_REVS "$@"
 
+get_var_from_env_or_config "GIT_PERF_MAKE_COMMAND" "perf.makeCommand"
+get_var_from_env_or_config "GIT_PERF_MAKE_OPTS" "perf.makeOpts"
+
 GIT_PERF_AGGREGATING_LATER=t
 export GIT_PERF_AGGREGATING_LATER