tests/Makefile: Remove ./ prefix when running tests

If ran with obj=/absolute path, then tests were failing to execute
because the recipe tried running `.//absolutepath/...run`.

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I9c3638b1af7531dbe8e956dcbe168250a235ead4
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58806
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jakub Czapiga <jacz@semihalf.com>
diff --git a/tests/Makefile.inc b/tests/Makefile.inc
index 6397e9b..7a7ab1d 100644
--- a/tests/Makefile.inc
+++ b/tests/Makefile.inc
@@ -232,7 +232,7 @@
 $(alltests): $$($$(@)-bin)
 	rm -f $(testobj)/junit-$(subst /,_,$(patsubst $(testobj)/%/,%,$(dir $^)))\(*\).xml
 	rm -f $(testobj)/$(subst /,_,$^).failed
-	-./$^ || echo failed > $(testobj)/$(subst /,_,$^).failed
+	-$^ || echo failed > $(testobj)/$(subst /,_,$^).failed
 
 # Build a code coverage report by collecting all the gcov files into a single
 # report. If COV is not set, this might be a user error, and they're trying