gmake.mk: no docs if test only

* defs/gmake.mk (TEST_DEPENDS): make docs only when checking, but
  not only btest and test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51734 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

defs/gmake.mk

@@ -7,7 +7,7 @@ TEST_TARGETS += $(subst check,test-all,$(patsubst check-%,test-%,$(TEST_TARGETS)
 TEST_TARGETS := $(patsubst test-%,yes-test-%,$(patsubst btest-%,yes-btest-%,$(TEST_TARGETS)))
 TEST_DEPENDS := $(if $(TEST_TARGETS),$(filter all main exts,$(MAKECMDGOALS)))
 TEST_DEPENDS += $(if $(filter $(CHECK_TARGETS),$(MAKECMDGOALS)),main)
-TEST_DEPENDS += $(if $(filter all,$(INSTALLDOC)),docs)
+TEST_DEPENDS += $(if $(filter main,$(TEST_DEPENDS)),$(if $(filter all,$(INSTALLDOC)),docs))
 
 ifneq ($(filter -O0 -Od,$(optflags)),)
 override XCFLAGS := $(filter-out -D_FORTIFY_SOURCE=%,$(XCFLAGS))