upstream fix for changed handling of include file open failures in

upcoming gmake 4.3; ok kurt@

devel/jdk/11/patches/patch-make_common_MakeBase_gmk

@@ -0,0 +1,29 @@
+$OpenBSD: patch-make_common_MakeBase_gmk,v 1.1 2020/02/01 15:06:24 naddy Exp $
+
+gmake 4.3 changed the handling of include file open failures
+https://hg.openjdk.java.net/jdk/jdk/rev/0743e1d49930
+
+Index: make/common/MakeBase.gmk
+--- make/common/MakeBase.gmk.orig
++++ make/common/MakeBase.gmk
+@@ -974,15 +974,16 @@ DependOnVariableFileName = \
+ # Param 2 - (optional) name of file to store value in
+ DependOnVariableHelper = \
+     $(strip \
+-        $(eval -include $(call DependOnVariableFileName, $1, $2)) \
++        $(eval $1_filename := $(call DependOnVariableFileName, $1, $2)) \
++        $(if $(wildcard $($1_filename)), $(eval include $($1_filename))) \
+         $(if $(call equals, $(strip $($1)), $(strip $($1_old))),,\
+-          $(call MakeDir, $(dir $(call DependOnVariableFileName, $1, $2))) \
++          $(call MakeDir, $(dir $($1_filename))) \
+           $(if $(findstring $(LOG_LEVEL), trace), \
+               $(info NewVariable $1: >$(strip $($1))<) \
+               $(info OldVariable $1: >$(strip $($1_old))<)) \
+           $(call WriteFile, $1_old:=$(call DoubleDollar,$(call EscapeHash,$($1))), \
+-              $(call DependOnVariableFileName, $1, $2))) \
+-        $(call DependOnVariableFileName, $1, $2) \
++              $($1_filename))) \
++        $($1_filename) \
+     )
+ 
+ # Main macro