mixed-precision: update mixedmode base #2288

Job	Run time
build (--disable-openmp, --with-yaml, --enable-deprecated-io)	1m 40s
build (--disable-openmp, --with-yaml, --disable-deprecated-io)	1m 40s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	1m 42s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	1m 38s
build (--enable-mixed-mode, --with-yaml, --enable-deprecated-io)	1s
build (--enable-mixed-mode, --with-yaml, --disable-deprecated-io)	1s
build (--enable-mixed-mode, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	1m 11s
build (--enable-mixed-mode, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	1m 36s
build (--disable-setting-flags, --with-yaml, --enable-deprecated-io)	1m 41s
build (--disable-setting-flags, --with-yaml, --disable-deprecated-io)	1m 41s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	1m 41s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	1m 41s
build (--with-mpi=no, --with-yaml, --enable-deprecated-io)	1s
build (--with-mpi=no, --with-yaml, --disable-deprecated-io)	1s
build (--with-mpi=no, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	1s
build (--with-mpi=no, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	1s
	16m 17s

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