updater: workaround cygwin python bug around command line arguments

Without the MAR env setting the python script only gets two command line
arguments, the script name and all the parameters as one string.

If someone knows a better fix I'm open to other suggestions.

Change-Id: I1acc4a74892d657c1c156b8953a5ab8a166aea92
Reviewed-on: https://gerrit.libreoffice.org/40778Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

Makefile.gbuild

@@ -42,9 +42,10 @@ upload-update-info:
 	$(eval BUILDID := $(shell git -C $(SRCDIR) log -1 --format=%H))
 	$(eval PLATFORM := $(RTL_OS)_$(RTL_ARCH))
 	$(eval UPDATE_DIR := $(WORKDIR)/update-info)
-	$(SRCDIR)/bin/update/create_build_config.py "$(PRODUCTNAME)" "$(VERSION)" "$(BUILDID)" "$(PLATFORM)" "$(UPDATE_DIR)" "$(UPDATE_CONFIG)"
-	$(SRCDIR)/bin/update/upload_builds.py "$(PRODUCTNAME)" "$(BUILDID)" "$(PLATFORM)" "$(UPDATE_DIR)" "$(UPDATE_CONFIG)"
-	$(SRCDIR)/bin/update/upload_build_config.py "$(UPDATE_DIR)" "$(UPDATE_CONFIG)"
+	$(eval VERSION := $(LIBO_VERSION_MAJOR).$(LIBO_VERSION_MINOR).$(LIBO_VERSION_MICRO).$(LIBO_VERSION_PATCH)$(LIBO_VERSION_SUFFIX)$(LIBO_VERSION_SUFFIX_SUFFIX))
+	MAR=$(INSTDIR)/program/mar $(SRCDIR)/bin/update/create_build_config.py "$(PRODUCTNAME)" "$(VERSION)" "$(BUILDID)" "$(PLATFORM)" "$(UPDATE_DIR)" "$(UPDATE_CONFIG)"
+	MAR=$(INSTDIR)/program/mar $(SRCDIR)/bin/update/upload_builds.py "$(PRODUCTNAME)" "$(BUILDID)" "$(PLATFORM)" "$(UPDATE_DIR)" "$(UPDATE_CONFIG)"
+	MAR=$(INSTDIR)/program/mar $(SRCDIR)/bin/update/upload_build_config.py "$(UPDATE_DIR)" "$(UPDATE_CONFIG)"
 
 create-partial-info:
 	$(eval BUILDID := $(shell git -C $(SRCDIR) log -1 --format=%H))