We only used md5sum for a diag message. So kill the dep

bin/kaleidoscope-builder

@@ -394,7 +394,6 @@ hex_with_bootloader () {
 
     awk '/^:00000001FF/ == 0' "${HEX_FILE_PATH}" > "${HEX_FILE_WITH_BOOTLOADER_PATH}"
     echo "Using ${BOOTLOADER_PATH}"
-    ${MD5} "${BOOTLOADER_PATH}"
     cat "${BOOTLOADER_PATH}" >> "${HEX_FILE_WITH_BOOTLOADER_PATH}"
     ln -sf -- "${OUTPUT_FILE_PREFIX}-with-bootloader.hex" "${OUTPUT_PATH}/${SKETCH_BASE_NAME}-latest-with-bootloader.hex"
     cat <<- EOF

etc/kaleidoscope-builder.conf

@@ -65,7 +65,6 @@ find_bootloader_ports() {
 }
 
 
-MD5="md5sum"
 
 if [ "${uname_S}" = "Darwin" ]; then
 
@@ -81,7 +80,6 @@ if [ "${uname_S}" = "Darwin" ]; then
     : "${ARDUINO_PATH:=/Applications/Arduino.app/Contents/Java/}"
     : "${ARDUINO_LOCAL_LIB_PATH:=${HOME}/Documents/Arduino}"
 
-    MD5="md5"
 
     find_bootloader_ports() {
         find_device_vid_pid
@@ -105,7 +103,6 @@ elif [ "${uname_S}" = "FreeBSD" ]; then
 	/bin/stty -f ${DEVICE_PORT} 1200
     }
 
-    MD5="md5"
     : "${AVR_SIZE:=/usr/local/bin/avr-size}"
     : "${AVR_NM:=/usr/local/bin/avr-nm}"
     : "${AVR_OBJDUMP:=/usr/local/bin/avr-objdump}"