lm32-toolchain release - v1.1-2023-04-04

Based on gcc-4.5.3, see doc/lm32-toolchain.pdf.

lm32-toolchain release - v1.0-2019-05-27

doc: we can now build gcc-4.5.1 w/ host gcc-8.2.1

Signed-off-by: Alessandro Rubini <[email protected]>