monit unconditionally uses `DADiskCreateFromVolumePath`, only available on macOS >= 10.7

[barracuda156]

/opt/local/bin/gcc-mp-14 -DHAVE_CONFIG_H -I. -I./src  -I/opt/local/include  -DDARWIN -DSYSCONFDIR="\"/opt/local/etc\"" -I./src -I./src/device -I./src/http -I./src/notification -I./src/process -I./src/protocols -I./src/ssl -I./src/terminal -I./libmonit/src -I/opt/local/include  -I/opt/local/include -pipe -Os -arch ppc -Wextra -fstack-protector-all -D_GNU_SOURCE -Wall -Wunused  -std=c11 -DREENTRANT -DNEED_SOCKLEN_T_DEFINED -I/opt/local/include -c -o src/device/device_common.o src/device/device_common.c
/opt/local/bin/gcc-mp-14 -DHAVE_CONFIG_H -I. -I./src  -I/opt/local/include  -DDARWIN -DSYSCONFDIR="\"/opt/local/etc\"" -I./src -I./src/device -I./src/http -I./src/notification -I./src/process -I./src/protocols -I./src/ssl -I./src/terminal -I./libmonit/src -I/opt/local/include  -I/opt/local/include -pipe -Os -arch ppc -Wextra -fstack-protector-all -D_GNU_SOURCE -Wall -Wunused  -std=c11 -DREENTRANT -DNEED_SOCKLEN_T_DEFINED -I/opt/local/include -c -o src/device/sysdep_DARWIN.o src/device/sysdep_DARWIN.c
/opt/local/bin/gcc-mp-14 -DHAVE_CONFIG_H -I. -I./src  -I/opt/local/include  -DDARWIN -DSYSCONFDIR="\"/opt/local/etc\"" -I./src -I./src/device -I./src/http -I./src/notification -I./src/process -I./src/protocols -I./src/ssl -I./src/terminal -I./libmonit/src -I/opt/local/include  -I/opt/local/include -pipe -Os -arch ppc -Wextra -fstack-protector-all -D_GNU_SOURCE -Wall -Wunused  -std=c11 -DREENTRANT -DNEED_SOCKLEN_T_DEFINED -I/opt/local/include -c -o src/http/base64.o src/http/base64.c
src/device/sysdep_DARWIN.c: In function '_getBlockDiskActivity':
src/device/sysdep_DARWIN.c:103:34: error: implicit declaration of function 'DADiskCreateFromVolumePath'; did you mean 'DADiskCreateFromIOMedia'? [-Wimplicit-function-declaration]
  103 |                 DADiskRef disk = DADiskCreateFromVolumePath(NULL, session, url);
      |                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                  DADiskCreateFromIOMedia
src/device/sysdep_DARWIN.c:103:34: error: initialization of 'DADiskRef' {aka 'struct __DADisk *'} from 'int' makes pointer from integer without a cast [-Wint-conversion]
make[2]: *** [src/device/sysdep_DARWIN.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory `/opt/local/var/macports/build/monit-4e94dd7f/work/monit-5.35.2'
make[1]: *** [all-recursive] Error 1

See: https://developer.apple.com/documentation/diskarbitration/dadiskcreatefromvolumepath(_:_:_:)