Migrate TODO items to GitHub Issues

[cooljeanius]

https://github.com/cooljeanius/dlcompat-20030629/blob/master/TODO

• Implement RTLD_LAZY, RTLD_SHARED, RTLD_UNSHARED, RTLD_LAZY_UNDEF, and RTLD_MAIN_ONLY (if needed). #2
• Fix the dladdr test in the testsuite. #3
• Tie the return code of dlsymtest to whether it was successful or not. #4
• Make the reimplementation of _dyld_func_lookup actually use its parameters. #5
• Check if we have pragma CALL_ON_LOAD, and find a suitable replacement for when it is missing. #6
• Use the NSModule api (?) #7
• Use the routine image_for_address (?) #8
• Use AvailabilityMacros to check for OS X version, and replace deprecated functions conditionally based on OS X version. #9
• Find out when SenTestingKit.framework was removed from Xcode, and port it to newer versions of macOS #10

[cooljeanius]

Edit: editing the contents of this comment into the OP instead