Add linuxArm32Hfp target

Also add missing targets in serialization test module

Author: ilya-g

core/build.gradle.kts

@@ -51,6 +51,9 @@ kotlin {
         target("androidNativeX86")
         target("androidNativeX64")
          */
+        // Tier 4 (deprecated, but still in demand)
+        target("linuxArm32Hfp")
+
         // Darwin targets are listed separately
         common("darwin") {
             // Tier 1

serialization/build.gradle.kts

@@ -15,6 +15,8 @@ java {
 kotlin {
     infra {
         target("linuxX64")
+        target("linuxArm64")
+        target("linuxArm32Hfp")
         target("mingwX64")
         target("macosX64")
         target("macosArm64")