make: Add projects.mk and prefixed win32 objects with win32-

- Add new makefile projects.mk, which is the place to define the minimally
  required set of variables to get a project's makefile oriented about
  the build machinery itself, mostly its locations in the file system. This
  also includes querying other projects. It's been pushed into a seperate
  makefile includeable early in the Makefile hierarchy, so that other
  special build variables (i.e. TARGET) can be specialized from within the
  project later to define build characteristics.
- Prefixed object files with $(FLAVOUR_PREFIX), to allow for building two
  targets from the same directory

Signed-off-by: Jan Lindemann <jan@janware.com>

make/projects.mk

@@ -0,0 +1,21 @@
+# == Variables for inter-project-communication
+
+# -- What do I know about myself?
+VERSION_FILE          ?= $(firstword $(wildcard VERSION $(TOPDIR)/VERSION))
+DEVELOPMENT           ?= $(shell grep -q 'dev' $(VERSION_FILE) && echo true)
+
+# -- Conclude the build system's location:
+CVS_PROJ_DIR          ?= $(TOPDIR)/..
+ifeq ($(DEVELOPMENT),true)
+  PROJECTS_DIR        ?= $(CVS_PROJ_DIR)
+else
+  PROJECTS_DIR        ?= /opt
+endif
+MOD_SCRIPT_DIR        ?= $(firstword $(wildcard $(MODDIR)/devutil/scripts $(MODDIR)/bin))
+
+# -- Query the build system about other projects:
+PYTHON                ?= /usr/bin/python
+proj_query             = $(shell $(PYTHON) $(MOD_SCRIPT_DIR)/projects.py -p $(PROJECTS_DIR) -t $(TOPDIR) $(PROJECTS_PY_EXTRA_ARGS) $(1))
+proj_dir               = $(call proj_query,proj-dir $(1))
+htdocs_dir             = $(call proj_query,htdocs-dir $(1))
+