Update libmultiprocess library

Add recent changes to support C++20 and fix some build issues:

bitcoin-core/libmultiprocess#89 pkgconfig: Drop -std=c++17 compile flag
bitcoin-core/libmultiprocess#90 pkgconfig: Use @CMAKE_INSTALL_LIBDIR@ variable

Author: ryanofsky

depends/packages/native_libmultiprocess.mk

@@ -1,8 +1,20 @@
 package=native_libmultiprocess
+<<<<<<< HEAD
 $(package)_version=8da797c5f1644df1bffd84d10c1ae9836dc70d60
+||||||| parent of 56ef459b5734 (Update libmultiprocess library)
+$(package)_version=414542f81e0997354b45b8ade13ca144a3e35ff1
+=======
+$(package)_version=2cbbd09d8b9972a8f5c68b510c0dae9a9f7a22da
+>>>>>>> 56ef459b5734 (Update libmultiprocess library)
 $(package)_download_path=https://github.com/chaincodelabs/libmultiprocess/archive
 $(package)_file_name=$($(package)_version).tar.gz
+<<<<<<< HEAD
 $(package)_sha256_hash=030f4d393d2ac9deba98d2e1973e22fc439ffc009d5f8ae3225c90639f86beb0
+||||||| parent of 56ef459b5734 (Update libmultiprocess library)
+$(package)_sha256_hash=8542dbaf8c4fce8fd7af6929f5dc9b34dffa51c43e9ee360e93ee0f34b180bc2
+=======
+$(package)_sha256_hash=a86416908cc4d27a41c58d846ca854730b1c56bd7a58d823348969e300a10014
+>>>>>>> 56ef459b5734 (Update libmultiprocess library)
 $(package)_dependencies=native_capnp
 
 define $(package)_config_cmds