check for sbrk() even on UNIX

* Turns out that not all UNIXes support sbrk().
  FreeBSD arm64 and riscv ports don't implement sbrk().
  It's also apparently not in POSIX - so other systems might also
  be affected.
  This needs to be passed on to dlmalloc.
* We now use DLMALLOC_CPPFLAGS instead of conditionals to pass
  on flags to dlmalloc.
* Should be backported to the FreeBSD v2.5.2 package
  to fix Poudriere fallout.

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