quackboot (same idea as klompboot), from audit6

this is based directly on the audit6 final revision.

same idea as klompboot. remove u-boot and arm support,
remove pico-serprog, remove support for making release
archives, and basically see how small the build
system can possible get.

quackboot *beats* the very first klompboot, at 790 lines,
because klompboot 1 was just over 800 lines. klompboot 2
was 701 lines. vendor file logic is about 200 sloc so
the next klompboot will be about 600 lines.

this is the very first quackboot.

Signed-off-by: Leah Rowe <leah@libreboot.org>

config/data/coreboot/mkhelper.cfg

@@ -13,4 +13,3 @@ eval `setvars "" $v`
 
 premake="mkvendorfiles"
 mkhelper="mkcorebootbin"
-postmake="mkcoreboottar"

config/data/pico-serprog/mkhelper.cfg

@@ -1,7 +0,0 @@
-. "include/rom.sh"
-
-sersrc="src/pico-serprog"
-serx="$sersrc/build/pico_serprog.uf2"
-picosdk="src/pico-sdk"
-serdir="$picosdk/src/boards/include/boards"
-premake="mkserprog rp2040"

config/data/stm32-vserprog/mkhelper.cfg

@@ -1,6 +0,0 @@
-. "include/rom.sh"
-
-sersrc="src/stm32-vserprog"
-serx="$sersrc/stm32-vserprog.hex"
-serdir="$sersrc/boards"
-mkhelper="mkserprog stm32"

config/data/u-boot/build.list

@@ -1,6 +0,0 @@
-u-boot
-u-boot.bin
-u-boot.dtb
-u-boot.img
-u-boot.itb
-u-boot.elf