Install libexec versions of julia.exe as well

Makefile

@@ -254,16 +254,22 @@ endif
 		mkdir -p $(DESTDIR)$$subdir; \
 	done
 
-	$(INSTALL_M) $(build_bindir)/julia $(DESTDIR)$(bindir)/
+	$(INSTALL_M) $(build_bindir)/julia$(EXE) $(DESTDIR)$(bindir)/
 ifeq ($(BUNDLE_DEBUG_LIBS),1)
-	$(INSTALL_M) $(build_bindir)/julia-debug $(DESTDIR)$(bindir)/
+	$(INSTALL_M) $(build_bindir)/julia-debug$(EXE) $(DESTDIR)$(bindir)/
 endif
 ifeq ($(OS),WINNT)
 	-$(INSTALL_M) $(filter-out $(build_bindir)/libjulia-debug.dll,$(wildcard $(build_bindir)/*.dll)) $(DESTDIR)$(bindir)/
 	-$(INSTALL_M) $(build_libdir)/libjulia.dll.a $(DESTDIR)$(libdir)/
 
 	# We have a single exception; we want 7z.dll to live in libexec, not bin, so that 7z.exe can find it.
 	-mv $(DESTDIR)$(bindir)/7z.dll $(DESTDIR)$(libexecdir)/
+
+	# We also have a `julia.exe` and `julia-debug.exe` that live in $(libexecdir)
+	$(INSTALL_M) $(build_libexecdir)/julia$(EXE) $(DESTDIR)$(libexecdir)/
+ifeq ($(BUNDLE_DEBUG_LIBS),1)
+	$(INSTALL_M) $(build_libexecdir)/julia-debug$(EXE) $(DESTDIR)$(libexecdir)/
+endif
 ifeq ($(BUNDLE_DEBUG_LIBS),1)
 	-$(INSTALL_M) $(build_bindir)/libjulia-debug.dll $(DESTDIR)$(bindir)/
 	-$(INSTALL_M) $(build_libdir)/libjulia-debug.dll.a $(DESTDIR)$(libdir)/