fix(build): try to get the env right

Jenkinsfile

@@ -3,7 +3,7 @@ def getArch(target) {
 }
 
 def getGCCTarget(rust_target) {
-	targetMapping = [
+	def targetMapping = [
 		"aarch64-unknown-linux-musl": "aarch64-linux-musl",
 		"arm-unknown-linux-musleabi": "arm-linux-musleabi",
 		"armv7-unknown-linux-musleabi": "armv7m-linux-musleabi",
@@ -48,7 +48,6 @@ pipeline {
 				stages {
 					stage('Build') {
 						steps {
-							withEnv(["${LINKER_ENV_KEY}=${CC}", "RUSTFLAGS=-C target-feature=+crt-static"]) {
 							sh """
 								printenv
 								cargo +nightly build \
@@ -58,7 +57,6 @@ pipeline {
 								"""
 						}
 					}
-					}
 
 					stage('Archive artifact') {
 						steps {