Support Darwin environment on buildroot/bin (#10751)

buildroot/bin/opt_disable

 #!/usr/bin/env bash
 
+SED=$(which gsed || which sed)
+
 for opt in "$@" ; do
-  eval "sed -i 's/\([[:blank:]]*\)\(#define \b${opt}\b\)/\1\/\/\2/g' Marlin/Configuration.h"
+  eval "${SED} -i 's/\([[:blank:]]*\)\(#define \b${opt}\b\)/\1\/\/\2/g' Marlin/Configuration.h"
 done

buildroot/bin/opt_disable_adv

 #!/usr/bin/env bash
 
+SED=$(which gsed || which sed)
+
 for opt in "$@" ; do
-  eval "sed -i 's/\([[:blank:]]*\)\(#define \b${opt}\b\)/\1\/\/\2/g' Marlin/Configuration_adv.h"
+  eval "${SED} -i 's/\([[:blank:]]*\)\(#define \b${opt}\b\)/\1\/\/\2/g' Marlin/Configuration_adv.h"
 done

buildroot/bin/opt_enable

 #!/usr/bin/env bash
 
+SED=$(which gsed || which sed)
+
 for opt in "$@" ; do
-  eval "sed -i 's/\/\/[[:blank:]]*\(#define \b${opt}\b\)/\1/g' Marlin/Configuration.h"
+  eval "${SED} -i 's/\/\/[[:blank:]]*\(#define \b${opt}\b\)/\1/g' Marlin/Configuration.h"
 done

buildroot/bin/opt_enable_adv

 #!/usr/bin/env bash
 
+SED=$(which gsed || which sed)
+
 for opt in "$@" ; do
-  eval "sed -i 's/\/\/[[:blank:]]*\(#define \b${opt}\b\)/\1/g' Marlin/Configuration_adv.h"
+  eval "${SED} -i 's/\/\/[[:blank:]]*\(#define \b${opt}\b\)/\1/g' Marlin/Configuration_adv.h"
 done

buildroot/bin/opt_set

 #!/usr/bin/env bash
 
-eval "sed -i 's/\(#define \b${1}\b\).*$/\1 ${2}/g' Marlin/Configuration.h"
+SED=$(which gsed || which sed)
+
+eval "${SED} -i 's/\(#define \b${1}\b\).*$/\1 ${2}/g' Marlin/Configuration.h"

buildroot/bin/opt_set_adv

 #!/usr/bin/env bash
 
-eval "sed -i 's/\(#define \b${1}\b\).*$/\1 ${2}/g' Marlin/Configuration_adv.h"
+SED=$(which gsed || which sed)
+
+eval "${SED} -i 's/\(#define \b${1}\b\).*$/\1 ${2}/g' Marlin/Configuration_adv.h"

buildroot/bin/pins_set

 #!/usr/bin/env bash
 
-eval "sed -i 's/\(#define \b${2}\b\).*$/\1 ${3}/g' Marlin/src/pins/pins_${1}.h"
+SED=$(which gsed || which sed)
+
+eval "${SED} -i 's/\(#define \b${2}\b\).*$/\1 ${3}/g' Marlin/src/pins/pins_${1}.h"