Build: implement useBootstrapStdlib flag

Excludes stdlib projects from build and uses bootstrap stdlib artifacts

 #KT-29205

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

@@ -4,7 +4,7 @@ plugins {
 }
 
 dependencies {
-    compile(project(":kotlin-stdlib"))
+    compile(kotlinStdlib())
     compile(files("${System.getProperty("java.home")}/../lib/tools.jar"))
     testCompile(commonDep("junit:junit"))
 }

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

@@ -7,7 +7,7 @@ plugins {
 jvmTarget = "1.6"
 
 dependencies {
-    compile(project(":kotlin-stdlib"))
+    compile(kotlinStdlib())
     compile(project(":compiler:frontend"))
     compile(project(":idea")) { isTransitive = false }
     compile(project(":idea:kotlin-gradle-tooling"))

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

@@ -6,7 +6,7 @@ plugins {
 }
 
 dependencies {
-    compile(project(":kotlin-stdlib"))
+    compile(kotlinStdlib())
 }
 
 jvmTarget = "1.6"