You have to link with JVM's library (add some reference to libjvm.a to the tcc's command line).
If you don't have a precompiled jvm.lib file for TurboC++, there is another option - link with the jvm.dll file and export all the methods from JVM manually. This uses the LoadLibrary/GetProcAddress functions.
For a short sample look at this:
HMODULE dll = LoadLibraryA("jvm.dll");
JNI_CreateJavaVM_func JNI_CreateJavaVM_ptr = GetProcAddress(dll, "JNI_CreateJavaVM");