Add more integration tests for SharedLibrary and backwards compatibility

build_tests/shared_library/src/lib/one.cc

@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+void one(void)
+{
+    printf("Hi from one()\n");
+}

build_tests/shared_library/src/lib/two.cc

@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+void two(void)
+{
+    printf("Hi from two()\n");
+}

build_tests/shared_library/src/main.cc

@@ -0,0 +1,8 @@
+#include "one.h"
+#include "two.h"
+
+int main(int argc, char * argv[])
+{
+    one();
+    two();
+}