pass --nmagic to the linker

rationale is in https://github.com/rust-embedded/cortex-m-quickstart/pull/95
we want to avoid potentially running into that issue in the future

.cargo/config.toml

@@ -5,6 +5,9 @@ rustflags = [
   "-C", "linker=flip-link",
   "-C", "link-arg=-Tlink.x",
   "-C", "link-arg=-Tdefmt.x",
+  # This is needed if your flash or ram addresses are not aligned to 0x10000 in memory.x
+  # See https://github.com/rust-embedded/cortex-m-quickstart/pull/95
+  "-C", "link-arg=--nmagic",
 ]
 
 [build]