fix(build): triple check that CC gets ets correctly

Jenkinsfile

@@ -39,7 +39,7 @@ pipeline {
 				environment {
 					GCC_TARGET = getGCCTarget(TARGET)
 					TARGET_ARCH = getArch(GCC_TARGET)
-					CC = "${GCC_TARGET}-gcc"
+					GCC = "${GCC_TARGET}-gcc"
 					LINKER_ENV_KEY = getLinkerEnv(TARGET)
 					PATH_CC = "/opt/${GCC_TARGET}-cross/bin:/home/sdk/.cargo/bin"
 					RUSTFLAGS = "-C target-feature=+crt-static"
@@ -49,7 +49,7 @@ pipeline {
 					stage('Build') {
 						steps {
 							sh '''
-								export PATH="$PATH_CC:$PATH"
+								export CC="$GCC" PATH="$PATH_CC:$PATH"
 								cargo +nightly build \
 									-Z build-std=std,panic_abort \
 									-Z build-std-features="optimize_for_size" \