Speed up builds by referencing github zips for shallow checkouts (#6441)

* Speed up builds by referencing github zips for shallow checkouts

* sadly the zips don't include submodules OR submodule metadata

variants/rak4631/platformio.ini

@@ -17,9 +17,9 @@ lib_deps =
   ${nrf52840_base.lib_deps}
   ${networking_base.lib_deps}
   melopero/Melopero RV3028@^1.1.0
-  https://github.com/RAKWireless/RAK13800-W5100S.git#1.0.2
+  https://github.com/RAKWireless/RAK13800-W5100S/archive/1.0.2.zip
   rakwireless/RAKwireless NCP5623 RGB LED library@^1.0.2
-  https://github.com/RAKWireless/RAK12034-BMX160.git#dcead07ffa267d3c906e9ca4a1330ab989e957e2
+  https://github.com/RAKWireless/RAK12034-BMX160/archive/dcead07ffa267d3c906e9ca4a1330ab989e957e2.zip
 
 ; If not set we will default to uploading over serial (first it forces bootloader entry by talking 1200bps to cdcacm)
 ; Note: as of 6/2013 the serial/bootloader based programming takes approximately 30 seconds
@@ -41,7 +41,7 @@ build_flags =
 
 lib_deps =
   ${env:rak4631.lib_deps}
-  https://github.com/geeksville/Armduino-Semihosting.git#35b538fdf208c3530c1434cd099a08e486672ee4
+  https://github.com/geeksville/Armduino-Semihosting/archive/35b538fdf208c3530c1434cd099a08e486672ee4.zip
 
 ; NOTE: the pyocd support for semihosting is buggy.  So I switched to using the builtin platformio support for the stlink adapter which worked much better.
 ; However the built in openocd version in platformio has buggy support for TCP to semihosting.