Attack compiler and rpmlint warnings
    
    - Add patch to fix highly-parallel build (e.g. -j16)
    - Add additional compiler warning flags to highlight questionable code
    - Add patch to fix comparisons between signed and unsigned integers
    - Add patch to fix const usage
    - Add patch to fix missing field initializers
    - Add patch to suppress warnings about possibly unused variables
    - Add patch to fix declarations that are not prototypes
    - Add patch to fix warnings about nested externs
    - Add patch to fix dubious typecasts that violate strict-aliasing rules
    - Update the FSF address references and GPLv2 license text
    - Use default optimization level (-O2) again
    
    Some of these patches have already been accepted upstream, with the
    rest having been submitted for review.