Fix issue if test:redox is run without build:redox

.gitlab-ci.yml

@@ -45,7 +45,7 @@ test:redox:
     variables:
         TARGET: x86_64-unknown-redox
     script:
-        - export CARGO="redoxer"
+        - export CARGO_TEST="redoxer"
         - export RUSTUP_TOOLCHAIN="$HOME/.redoxer/toolchain"
         - export PATH="$RUSTUP_TOOLCHAIN/bin:$PATH"
         - export TEST_RUNNER="redoxer exec --folder . -- sh --"

Makefile

 TARGET?=
 
 CARGO?=cargo
+CARGO_TEST?=$(CARGO)
 CARGOFLAGS=
 RUSTCFLAGS=
 
@@ -88,7 +89,7 @@ sysroot: all
 	touch $@
 
 test: sysroot
-	$(CARGO) test
+	$(CARGO_TEST) test
 	$(MAKE) -C tests verify
 
 # Debug targets