Test for compilerOpts in cinterop part of MPP plugin (#2300)

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/new-mpp-native-cinterop/projectLibrary/build.gradle

@@ -34,6 +34,7 @@ kotlin {
                 stdio {
                     packageName 'example.cinterop.project.stdio'
                     extraOpts '-nodefaultlibs'
+                    compilerOpts '-DEVEN_NUMBER'
                 }
             }
         }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/new-mpp-native-cinterop/projectLibrary/src/nativeInterop/cinterop/stdio.def

@@ -1,2 +1,12 @@
 headers = stdio.h
 compilerOpts.osx = -D_ANSI_SOURCE
+---
+
+int getNumber()
+{
+    #ifdef EVEN_NUMBER
+        return 2;
+    #else
+        return 1;
+    #endif
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/new-mpp-native-cinterop/projectLibrary/src/nativeTest/kotlin/test.kt

@@ -5,8 +5,14 @@
 package example.cinterop.project
 
 import kotlin.test.*
+import example.cinterop.project.stdio.*
 
 @Test
 fun projectTest() {
     projectPrint("Project test")
 }
+
+@Test
+fun compilerOptsTest() {
+    assertEquals(2, getNumber())
+}