Add INNO_ARGS makefile var for signtool (#37236)

(cherry picked from commit 05a0d54)

Author: musm

Makefile

@@ -477,7 +477,7 @@ endif
 
 exe:
 	# run Inno Setup to compile installer
-	$(call spawn,$(JULIAHOME)/dist-extras/inno/iscc.exe /DAppVersion=$(JULIA_VERSION) /DSourceDir="$(call cygpath_w,$(BUILDROOT)/julia-$(JULIA_COMMIT))" /DRepoDir="$(call cygpath_w,$(JULIAHOME))" /F"$(JULIA_BINARYDIST_FILENAME)" /O"$(call cygpath_w,$(BUILDROOT))" $(call cygpath_w,$(JULIAHOME)/contrib/windows/build-installer.iss))
+	$(call spawn,$(JULIAHOME)/dist-extras/inno/iscc.exe /DAppVersion=$(JULIA_VERSION) /DSourceDir="$(call cygpath_w,$(BUILDROOT)/julia-$(JULIA_COMMIT))" /DRepoDir="$(call cygpath_w,$(JULIAHOME))" /F"$(JULIA_BINARYDIST_FILENAME)" /O"$(call cygpath_w,$(BUILDROOT))" $(INNO_ARGS) $(call cygpath_w,$(JULIAHOME)/contrib/windows/build-installer.iss))
 	chmod a+x "$(BUILDROOT)/$(JULIA_BINARYDIST_FILENAME).exe"
 
 app:

contrib/windows/build-installer.iss

@@ -74,6 +74,9 @@ UninstallDisplayName={#AppNameLong}
 UninstallDisplayIcon={app}\{#AppMainExeName}
 UninstallFilesDir={app}\uninstall
 
+#ifdef Sign
+SignTool=mysigntool
+#endif
 
 [Languages]
 Name: "english"; MessagesFile: "compiler:Default.isl"