Load fake.rb at `BTESTRUBY`

So that `mkmf` checks work from `make run`, and also remove
duplicate `$(MINIRUBYOPT)` which is used in `$(MINIRUBY)`.

common.mk

@@ -765,7 +765,7 @@ $(arch)-fake.rb: $(srcdir)/template/fake.rb.in $(tooldir)/generic_erb.rb version
 
 btest: $(TEST_RUNNABLE)-btest
 no-btest: PHONY
-yes-btest: fake miniruby$(EXEEXT) PHONY
+yes-btest: yes-fake miniruby$(EXEEXT) PHONY
 	$(ACTIONS_GROUP)
 	$(Q)$(exec) $(BOOTSTRAPRUBY) "$(srcdir)/bootstraptest/runner.rb" --ruby="$(BTESTRUBY) $(RUN_OPTS)" $(OPTS) $(TESTOPTS) $(BTESTS)
 	$(ACTIONS_ENDGROUP)
@@ -777,7 +777,7 @@ yes-btest-ruby: prog PHONY
 	$(Q)$(exec) $(RUNRUBY) "$(srcdir)/bootstraptest/runner.rb" --ruby="$(PROGRAM) -I$(srcdir)/lib $(RUN_OPTS)" -q $(OPTS) $(TESTOPTS) $(BTESTS)
 	$(ACTIONS_ENDGROUP)
 
-rtest: fake miniruby$(EXEEXT) PHONY
+rtest: yes-fake miniruby$(EXEEXT) PHONY
 	$(ACTIONS_GROUP)
 	$(Q)$(exec) $(BOOTSTRAPRUBY) "$(srcdir)/bootstraptest/runner.rb" --ruby="$(BTESTRUBY) $(RUN_OPTS)" --sets=ractor -v
 	$(ACTIONS_ENDGROUP)
@@ -1243,7 +1243,7 @@ $(srcdir)/ext/etc/constdefs.h: $(srcdir)/ext/etc/depend
 
 ##
 
-run: fake miniruby$(EXEEXT) PHONY
+run: yes-fake miniruby$(EXEEXT) PHONY
 	$(BTESTRUBY) $(RUNOPT0) $(TESTRUN_SCRIPT) $(RUNOPT)
 
 runruby: $(PROGRAM) PHONY
@@ -1252,7 +1252,7 @@ runruby: $(PROGRAM) PHONY
 runirb: $(PROGRAM) PHONY
 	RUBY_ON_BUG='gdb -x $(srcdir)/.gdbinit -p' $(RUNRUBY) $(RUNOPT0) -r irb -e 'IRB.start("make runirb")' $(RUNOPT)
 
-parse: fake miniruby$(EXEEXT) PHONY
+parse: yes-fake miniruby$(EXEEXT) PHONY
 	$(BTESTRUBY) --dump=parsetree_with_comment,insns $(TESTRUN_SCRIPT)
 
 bisect: PHONY

template/Makefile.in

@@ -147,8 +147,7 @@ RUNRUBY = @RUNRUBY@ $(RUN_OPTS)
 # RUNRUBY_DEBUGGER:: debugging option for runruby.rb
 RUNRUBY_DEBUGGER = --debugger='gdb -x run.gdb --quiet --args'
 XRUBY = @XRUBY@
-BTESTRUBY = @BTESTRUBY@\
-	$(MINIRUBYOPT)
+BTESTRUBY = @BTESTRUBY@ -r./$(arch)-fake
 INSTALL = @INSTALL@
 INSTALL_DATA = @INSTALL_DATA@
 INSTALL_SCRIPT = @INSTALL_SCRIPT@

template/fake.rb.in

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+# shareable_constant_value: literal
 <%
 arg = {}
 while /\A(\w+)=(.*)/ =~ ARGV[0]

win32/Makefile.sub

@@ -385,7 +385,7 @@ BOOTSTRAPRUBY = $(BASERUBY)
 BOOTSTRAPRUBY = $(MINIRUBY)
 XRUBY = $(RUNRUBY)
 !endif
-BTESTRUBY = $(MINIRUBY)
+BTESTRUBY = $(MINIRUBY) -r./$(arch)-fake
 !ifndef RUBY
 RUBY = ruby
 !endif