Build: suppress deprecated JVM target warning globally

There seems to be no point in configuring the compiler argument per
project. This argument will be deleted soon anyway, when we remove
support for JDK 1.6 & 1.7.

Also remove `disableDeprecatedJvmTargetWarning`. It didn't have any
effect in all modules where it was applied because these modules
reassign `freeCompilerArgs` anyway, with
`-Xsuppress-deprecated-jvm-target-warning` in it.

plugins/android-extensions/android-extensions-runtime/build.gradle.kts

@@ -22,9 +22,3 @@ publish()
 runtimeJar()
 sourcesJar()
 javadocJar()
-
-tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach {
-    kotlinOptions {
-        freeCompilerArgs += "-Xsuppress-deprecated-jvm-target-warning"
-    }
-}

plugins/kapt3/kapt3-runtime/build.gradle.kts

@@ -21,9 +21,3 @@ publish()
 runtimeJar()
 sourcesJar()
 javadocJar()
-
-tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach {
-    kotlinOptions {
-        freeCompilerArgs += "-Xsuppress-deprecated-jvm-target-warning"
-    }
-}

plugins/parcelize/parcelize-runtime/build.gradle.kts

@@ -25,9 +25,3 @@ publish {
 runtimeJar()
 sourcesJar()
 javadocJar()
-
-tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach {
-    kotlinOptions {
-        freeCompilerArgs += "-Xsuppress-deprecated-jvm-target-warning"
-    }
-}