Upgrade minimum macOS version to 10.15 (Catalina) (#257)

Required for C++17, aligned alloc etc.

build.sh

@@ -46,7 +46,7 @@ for flavour in darwin-x64 darwin-arm64v8; do
     export PKG_CONFIG="$(brew --prefix)/bin/pkg-config --static"
 
     # Earliest supported version of macOS
-    export MACOSX_DEPLOYMENT_TARGET="10.13"
+    export MACOSX_DEPLOYMENT_TARGET="10.15"
 
     # Added -fno-stack-check to workaround a stack misalignment bug on macOS 10.15
     # See:

build/lin.sh

@@ -203,9 +203,6 @@ fi
 mkdir ${DEPS}/zlib-ng
 $CURL https://github.com/zlib-ng/zlib-ng/archive/${VERSION_ZLIB_NG}.tar.gz | tar xzC ${DEPS}/zlib-ng --strip-components=1
 cd ${DEPS}/zlib-ng
-if [ "$MACOSX_DEPLOYMENT_TARGET" = "10.13" ]; then
-  sed -i'.bak' "/-DHAVE_ALIGNED_ALLOC/d" CMakeLists.txt
-fi
 CFLAGS="${CFLAGS} -O3" cmake -G"Unix Makefiles" \
   -DCMAKE_TOOLCHAIN_FILE=${ROOT}/Toolchain.cmake -DCMAKE_INSTALL_PREFIX=${TARGET} -DCMAKE_INSTALL_LIBDIR=lib -DCMAKE_BUILD_TYPE=Release \
   -DBUILD_SHARED_LIBS=FALSE -DZLIB_COMPAT=TRUE -DWITH_ARMV6=FALSE

platforms/darwin-x64/Toolchain.cmake

@@ -2,7 +2,7 @@ SET(CMAKE_C_COMPILER clang)
 SET(CMAKE_CXX_COMPILER clang++)
 
 # Earliest supported version of macOS
-SET(CMAKE_OSX_DEPLOYMENT_TARGET 10.13)
+SET(CMAKE_OSX_DEPLOYMENT_TARGET 10.15)
 
 set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
 set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)