Add first c test to test the C api

lib/runtime-c-api/tests/.gitignore

@@ -0,0 +1,12 @@
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+Makefile
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+CTestTestfile.cmake
+_deps
+test-instantiate

lib/runtime-c-api/tests/CMakeLists.txt

@@ -0,0 +1,11 @@
+cmake_minimum_required (VERSION 2.6)
+project (WasmerCApiTests)
+
+add_executable(test-instantiate test-instantiate.c)
+
+target_link_libraries(test-instantiate
+        general "${CMAKE_SOURCE_DIR}/../../../target/debug/libwasmer_runtime_c_api.dylib")
+
+enable_testing()
+add_test(test-instantiate test-instantiate)
+

lib/runtime-c-api/tests/runtime_c_api_tests.rs

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+#[test]
+fn test_c_api() {
+    // TODO run `cmake . && make && make test`
+}

lib/runtime-c-api/tests/test-instantiate.c

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+#include <stdio.h>
+#include "../wasmer.h"
+
+int main()
+{
+    wasmer_import_object_t *import_object = wasmer_import_object_new();
+    wasmer_import_object_destroy(import_object);
+    return 0;
+}