Revert "Set apiValidation.klib.strictValidation = true"

This reverts commit 7160baf.

Author: lauzadis

gradle.properties

@@ -1,9 +1,6 @@
 kotlin.code.style=official
 kotlin.mpp.stability.nowarn=true
 
-# Enable API validation for all source sets: https://github.com/Kotlin/binary-compatibility-validator/issues/234
-apiValidation.klib.strictValidation = true
-
 # gradle
 org.gradle.jvmargs=-Xmx2G -XX:MaxMetaspaceSize=1G