multiarc: copy custom.ini to correct location #134

Job	Run time
build-mingw (mingw_gcc_x64_debug)	20m 3s
build-mingw (mingw_gcc_x64_release)	8m 44s
build-msbuild (msbuild_cl_x64_debug)	21m 17s
build-mingw (mingw_clang_x64_debug)	5m 55s
build-msbuild (msbuild_cl_x64_release)	5m 20s
build-nmake (nmake_cl_x64_debug)	20m 11s
build-mingw (mingw_clang_x64_release)	8m 43s
build-msbuild (msbuild_cl_x86_debug)	5m 12s
build-nmake (nmake_cl_x64_release)	4m 7s
build-mingw (mingw_llvm_x64_debug)	4m 38s
build-msbuild (msbuild_cl_x86_release)	5m 2s
build-nmake (nmake_cl_x86_debug)	4m 9s
build-mingw (mingw_llvm_x64_release)	7m 35s
build-msbuild (msbuild_cl_ARM64_release)	5m 43s
build-nmake (nmake_cl_x86_release)	4m 58s
code-style-checks	5s
changelog-hlf-checks	14s
build-nmake (nmake_cl_ARM64_release)	4m 49s
build-nmake (nmake_clang_x64_debug)	10m 30s
build-nmake (nmake_clang_x64_release)	16m 29s
	2h 43m 44s

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