fix --enable-wix switch - that didn't do anything

it used the wrong variable name in AC_SUBST and also had no place where
it would be set for the rest of the build to use.
Also the script hardcodes the location of the WiX Toolkit, so check for
the same path in configure.
Also it was needlessly tied to LIBO_TEST_INSTALL - since it has its own
conditional, "double-guarding" it is not necessary.

Change-Id: I6dd4a41e63d2a43a3e2f1aac5b6799a6601eb656
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/159510
Tested-by: Jenkins
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>

config_host.mk.in

@@ -247,6 +247,7 @@ export ENABLE_WASM_STRIP_SPLASH=@ENABLE_WASM_STRIP@
 export ENABLE_WASM_STRIP_SWEXPORTS=@ENABLE_WASM_STRIP@
 export ENABLE_WASM_STRIP_SCEXPORTS=@ENABLE_WASM_STRIP@
 export ENABLE_WERROR=@ENABLE_WERROR@
+ENABLE_WIX=@ENABLE_WIX@
 export ENABLE_Z7_DEBUG=@ENABLE_Z7_DEBUG@
 export ENDIANNESS=@ENDIANNESS@
 export EPM=@EPM@

configure.ac

@@ -13680,12 +13680,14 @@ if test "$enable_wix" = "" -o "enable_wix" = "no"; then
     ENABLE_WIX=
 else
     AC_MSG_RESULT([yes])
-    if ! which candle  >/dev/null 2>&1; then
-      AC_MSG_ERROR([WiX requested but WiX toolset not found.])
+    # FIXME: this should do proper detection, but the path is currently
+    # hardcoded in msicreator/createmsi.py
+    if ! test -x "/cygdrive/c/Program Files (x86)/WiX Toolset v3.11/bin/candle"; then
+      AC_MSG_ERROR([WiX requested but WiX toolset v3.11 not found at the expected location])
     fi
     ENABLE_WIX=TRUE
 fi
-AC_SUBST(ENABLE_SILENT_MSI)
+AC_SUBST(ENABLE_WIX)
 
 AC_MSG_CHECKING([whether and how to use Xinerama])
 if test "$USING_X11" = TRUE; then

instsetoo_native/CustomTarget_install.mk

@@ -59,7 +59,7 @@ endif
 # delimiter is U+2027 Hyphenation point - files with colon in their name confuse the heck out of
 # make and cannot be used as targets or prerequisites. For passing to call_installer.sh it is
 # substituted by the : so that cut doesn't stumble over the delimiter
-ifeq (TRUE,$(LIBO_TEST_INSTALL))
+ifeq (TRUE,$(filter TRUE,$(LIBO_TEST_INSTALL) $(ENABLE_WIX))
 instsetoo_installer_targets = openoffice‧en-US‧‧‧archive‧nostrip
 ifeq (ODK,$(filter ODK,$(BUILD_TYPE)))
 instsetoo_installer_targets += sdkoo‧en-US‧_SDK‧‧archive‧nostrip
@@ -129,8 +129,8 @@ $(instsetoo_installer_targets): $(SRCDIR)/solenv/bin/make_installer.pl \
 $(call gb_CustomTarget_get_workdir,instsetoo_native/install)/install.phony: $(instsetoo_installer_targets)
 	$(call gb_Output_announce,$(subst $(WORKDIR)/,,$@),$(true),PRL,2)
 	$(call gb_Trace_StartRange,$(subst $(WORKDIR)/,,$@),PRL)
-ifeq (TRUE,$(LIBO_TEST_INSTALL))
 	$(if $(ENABLE_WIX),$(call gb_ExternalExecutable_get_command,python) $(SRCDIR)/msicreator/create_installer.py $(BUILDDIR) $(SRCDIR) $(LIBO_VERSION) $(PRODUCTNAME_WITHOUT_SPACES))
+ifeq (TRUE,$(LIBO_TEST_INSTALL))
 	unzip -q -d $(TESTINSTALLDIR) $(instsetoo_OUT)/$(PRODUCTNAME_WITHOUT_SPACES)/archive/install/en-US/LibreOffice*_archive.zip
 	mv $(TESTINSTALLDIR)/LibreOffice*_archive/LibreOffice*/* $(TESTINSTALLDIR)/
 	rmdir $(TESTINSTALLDIR)/LibreOffice*_archive/LibreOffice*

instsetoo_native/Module_instsetoo_native.mk

@@ -9,7 +9,7 @@
 
 $(eval $(call gb_Module_Module,instsetoo_native))
 
-ifneq (,$(PKGFORMAT)$(filter TRUE,$(LIBO_TEST_INSTALL)))
+ifneq (,$(PKGFORMAT)$(filter TRUE,$(LIBO_TEST_INSTALL) $(ENABLE_WIX)))
 
 $(eval $(call gb_Module_add_targets,instsetoo_native,\
 	CustomTarget_install \