Rather than assume all dependencies are required for all programs, split them out. This will make packaging easier, as well as splitting the code to use subprojects. Note that due to the use of config.h semantics, in most cases the got_compat.h header file is now at the top of the .c file it is included in, so that it can handle the system header inclusion properly.

So that the command-line flags to CC don't get drowned out with copious -D flags, move this detection to config.h instead. Note that to reduce the code churn, the existing include/got_compat.h header file has been renamed, and the generated file replaces it, but with the contents of the original header file included. Eventually, we might want to move some od the logic in include/got_compat2.h into AH_VERBATIM() blocks, but for now, this is a good compromise.