Commit Briefs
Stop including <sys/syslimits.h> directly.
POSIX says the limits defined there are available from <limits.h>, which almost all affected source files already included anyway. ok millert stsp
make got-read-blob account for header len in size check
Fixes "no space" error with blobs which happen to straddle the size boundary for in-memory handling.
got_error_from_errno -> got_error_prefix_errno
also add got_error_prefix_errno2 and got_error_prefix_errno3 which should hopefully all be merged into a single function with variadic args (but can't alloc mem)