macOS: use GCC 10 for building, since GCC 9 is no longer in Homebrew

macOS/build.sh

@@ -22,8 +22,8 @@ set -ex
 ROOTDIR=$(pwd)/..
 
 # Set the compilers
-CC=gcc-9
-CXX=g++-9
+CC=gcc-10
+CXX=g++-10
 
 # Set the number of threads
 NTHREADS=$(nproc)

preprocessor @ 64ebb362

-Subproject commit c6ad212c8a068f68b12b161b7d0301c3ef1619a9
+Subproject commit 64ebb3629080fa7f8542f6805478911d1fae15f2