Merge bitcoin/bitcoin#30513: depends: Bump libmultiprocess for CMake fixes

ec0e805 depends: Bump `libmultiprocess` for CMake fixes (Hennadii Stepanov)

Pull request description:

  This PR amends bitcoin/bitcoin#30490 and bumps the upstream branch, which now includes a required CMake [fix](bitcoin-core/libmultiprocess#103).

  Addresses bitcoin/bitcoin#30490 (comment).

  The CI logs are available in bitcoin/bitcoin#29790 where the recent [push](https://github.com/hebasto/bitcoin/tree/pr29790-0723.2.mp) uses this PR implementation.

ACKs for top commit:
  ryanofsky:
    Code review ACK ec0e805
  theuni:
    utACK ec0e805.

Tree-SHA512: e300a27bcab80a63a518719e9af8e10a938294fc07289cadbf4a7744627c10b0e9541a36971d08b65152f3f7d0eb434e427274d9c9d9f0bdd216afd914027a0f

Author: fanquake

depends/packages/native_libmultiprocess.mk

@@ -1,8 +1,8 @@
 package=native_libmultiprocess
-$(package)_version=8b8a4766ce0a1892b9e8a5eb73dc39821005e520
+$(package)_version=6aca5f389bacf2942394b8738bbe15d6c9edfb9b
 $(package)_download_path=https://github.com/chaincodelabs/libmultiprocess/archive
 $(package)_file_name=$($(package)_version).tar.gz
-$(package)_sha256_hash=475c0dc2357a2ff30e9a164e4c16dc8a6597a57c9193d646fa9cbf0a55c45d78
+$(package)_sha256_hash=2efeed53542bc1d8af3291f2b6f0e5d430d86a5e04e415ce33c136f2c226a51d
 $(package)_dependencies=native_capnp
 
 define $(package)_config_cmds