Forward Python version selection to CASE submodule

No effects were observed on Make-managed files.

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

Author: ajnelson-nist

Makefile

@@ -127,6 +127,7 @@ check: \
   check-ontology \
   check-shapes
 	$(MAKE) \
+	  PYTHON3=$(PYTHON3) \
 	  --directory tests \
 	  check
 

tests/Makefile

@@ -16,6 +16,8 @@
 
 SHELL := /bin/bash
 
+PYTHON3 ?= python3
+
 top_srcdir := $(shell cd .. ; pwd)
 
 case_srcdir := $(top_srcdir)/dependencies/CASE
@@ -92,6 +94,7 @@ monolithic.ttl: \
   $(profile_ttls) \
   $(shape_ttls)
 	$(MAKE) \
+	  PYTHON3=$(PYTHON3) \
 	  --directory $(case_srcdir) \
 	  .venv.done.log
 	$(MAKE) \