SSIA, there is no static version of the libdl library

This makes static builds which attempt to dynamically open other libraries impossible. Missing libz.a or libm.a could be worked around by using dlopen()/dlsym()/dlclose(), but missing libdl.a cannot be worked around (unless one is an expert with writing one's own dynamic linker).

Environment Details

• NDK Version: 15.1.4119039
• Build sytem: ndk-build
• Host OS: Linux
• Compiler: Clang
• NDK API level: All (find ${NDK_DIR} -name libdl.a => no results)