Remove STM32 variant (and submodule libopencm3)

[z180-stamp.git] / libopencm3

diff --git a/libopencm3 b/libopencm3
deleted file mode 160000 (submodule)
index ec22543..0000000
--- a/libopencm3
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit ec22543ce8d595b19607b067cd27c081808fc425