Add C artifact to gitignore and make file

Author: gjbex

source-code/cython/Primes/.gitignore

@@ -1 +1,3 @@
 primes_cython.c
+primes_cython3.c
+primes_pure_python.c

source-code/cython/Primes/Makefile

@@ -1,5 +1,6 @@
 VERSION = cpython-311-x86_64-linux-gnu
-PRIMES_LIBS = primes_cython.$(VERSION).so primes_pure_python.$(VERSION).so
+PRIMES_LIBS = primes_cython.$(VERSION).so primes_cython3.$(VERSION).so \
+			  primes_pure_python.$(VERSION).so
 
 all: $(PRIMES_LIBS)
 
@@ -8,5 +9,5 @@ $(PRIMES_LIBS): primes_cython.pyx primes_pure_python.py
 
 clean:
 	python setup.py clean
-	$(RM) primes_cython.c primes_pure_python.c $(PRIMES_LIBS)
+	$(RM) primes_cython.c primes_cython3.c primes_pure_python.c $(PRIMES_LIBS)
 	$(RM) -r build/