Fix big endian stage, only run modern tests

Author: Matt Woodward

.github/workflows/c.yaml

@@ -126,7 +126,7 @@ jobs:
           sudo apt-get -qq install gcc-multilib-mips-linux-gnu gcc-mips-linux-gnu qemu-user g++-mips-linux-gnu
 
       - name: Run big endian tests
-        run: make test-c
+        run: make test-c-modern
         env:
           CC: mips-linux-gnu-gcc
           CXX: mips-linux-gnu-g++

Makefile

@@ -382,7 +382,7 @@ test-c:
 	$(MAKE) do-all-tests
 	$(call announce-end,"Finished running C tests")
 
-test-c-v4:
+test-c-modern:
 	$(call announce-begin,"Running C tests")
 	cd $(SWIFTNAV_ROOT)/c; \
 	mkdir -p build/ && cd build/; \