config file for macOS with GCC 10 and open-mpi 4.0.5 added

config/macOS/gcc10-openmpi405.sh

+export OTB_TOOLSET=gcc
+export OTB_COMPILER_VERSION=10.3.0
+export OTB_MPI=openmpi
+export OTB_MPI_VERSION=4.0.5
+
+declare -a OTB_RECIPES=(
+	010-build-gmp
+	020-build-mpfr
+	030-build-mpc
+	040-build-gcc
+	050-build-cmake
+	060-build-openmpi
+	070-build-zlib
+	080-build-hdf5
+	090-build-gsl
+	100-build-h5hut
+	110-build-boost
+	200-build-parmetis
+	210-build-openblas
+	220-build-trilinos
+	230-build-amrex
+	300-build-gtest)
+
+declare -A OTB_SYMLINKS
+OTB_SYMLINKS[bin/cc]="/opt/local/bin/${OTB_COMPILER_VERSION}"
+OTB_SYMLINKS[bin/gcc]="/opt/local/bin/${OTB_COMPILER_VERSION}"
+OTB_SYMLINKS[bin/c++]="/opt/local/bin/${OTB_COMPILER_VERSION/gcc/g++}"
+OTB_SYMLINKS[bin/g++]="/opt/local/bin/${OTB_COMPILER_VERSION/gcc/g++}"
+OTB_SYMLINKS[bin/gfortran]="/opt/local/bin/${OTB_COMPILER_VERSION/gcc/gfortran}"