libc: add LIBC_MALLOC option

This will enable alternative mallocs to be included in the tree and
selected by setting LIBC_MALLOC. As there is only one today (jemalloc)
this option does nothing, but

libc: add LIBC_MALLOC option

This will enable alternative mallocs to be included in the tree and
selected by setting LIBC_MALLOC. As there is only one today (jemalloc)
this option does nothing, but we expect to add other implementations
in the future. This will also reduce diffs to CheriBSD.

Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D41660

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libc: regoranize malloc build

Create a stdlib/malloc to hold the definition of the malloc interface
(e.g., the Symbol.map file) and make jemalloc a subdirectory. This will
make it easier to integra

libc: regoranize malloc build

Create a stdlib/malloc to hold the definition of the malloc interface
(e.g., the Symbol.map file) and make jemalloc a subdirectory. This will
make it easier to integrate alternative allocators such as snmalloc
while making it clear that the current jemalloc symbols are the FreeBSD
API/ABI (for better or worse).

Suggested by: jrtc27
Reviewed by: jrtc27, emaste
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D41457

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