Fix #1294 bug where BIMTester doesn't run if you have multiple drives on Windows. Thanks @rbertucat!

src/ifcbimtester/patch/model_core.patch

@@ -0,0 +1,14 @@
+--- behave/model_core.py	2018-02-26 02:53:03.000000000 +1100
++++ /home/dion/Projects/IfcOpenShell/src/ifcblenderexport/patch-behave-model_core.py	2021-03-21 11:57:27.625195794 +1100
+@@ -269,7 +269,10 @@
+ class BasicStatement(object):
+     def __init__(self, filename, line, keyword, name):
+         filename = filename or '<string>'
+-        filename = os.path.relpath(filename, os.getcwd())   # -- NEEDS: abspath?
++        try:
++            filename = os.path.relpath(filename, os.getcwd())   # -- NEEDS: abspath?
++        except ValueError:
++            pass
+         self.location = FileLocation(filename, line)
+         assert isinstance(keyword, six.text_type)
+         assert isinstance(name, six.text_type)

src/ifcbimtester/patch/runner_util.patch

@@ -0,0 +1,14 @@
+--- behave/runner_util.py	2018-02-26 02:53:03.000000000 +1100
++++ /home/dion/Projects/IfcOpenShell/src/ifcblenderexport/patch-behave-runner_util.py	2021-03-21 11:58:29.777638958 +1100
+@@ -381,7 +381,10 @@
+     locals_["__file__"] = filename
+     with open(filename, "rb") as f:
+         # pylint: disable=exec-used
+-        filename2 = os.path.relpath(filename, os.getcwd())
++        try:
++            filename2 = os.path.relpath(filename, os.getcwd())
++        except ValueError:
++            filename2 = filename
+         code = compile(f.read(), filename2, "exec", dont_inherit=True)
+         exec(code, globals_, locals_)
+ 

src/ifcblenderexport/Makefile

@@ -249,6 +249,11 @@ endif
 	cd dist/working && wget https://files.pythonhosted.org/packages/c8/4b/d0a8c23b6c8985e5544ea96d27105a273ea22051317f850c2cdbf2029fe4/behave-1.2.6.tar.gz
 	cd dist/working && tar -xzvf behave*
 	cd dist/working/behave-1.2.6/ && cp -r behave ../../blenderbim/libs/site/packages/
+	# See bug #1294
+	cd dist/working/ && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcbimtester/patch/model_core.patch
+	cd dist/working/ && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcbimtester/patch/runner_util.patch
+	cd dist/working/ && patch ../../blenderbim/libs/site/packages/behave/model_core.py < model_core.patch
+	cd dist/working/ && patch ../../blenderbim/libs/site/packages/behave/runner_util.py < runner_util.patch
 	rm -rf dist/working
 
 	# Required by behave