Global cleanup: Fix a few spelling errors

Just a trivial patch to fix a few errors found by codespell.

Here's the command I used:
codespell -S subprojects,out \
-L fwe,dout,tast,crate,parms,claus,nt,nd,te,truns,trun

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: I4e3b277f220fa70dcab21912c30f1d26d9bd8749
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/62840
Original-Reviewed-by: Felix Singer <felixsinger@posteo.net>
Original-Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Original-Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/71455
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/Makefile b/Makefile
index fc21928..fa0c270 100644
--- a/Makefile
+++ b/Makefile
@@ -73,7 +73,7 @@
 
 # Set LC_ALL=C to minimize influences of the locale.
 # However, this won't work for the majority of relevant commands because they use the $(shell) function and
-# GNU make does not relay variables exported within the makefile to their evironment.
+# GNU make does not relay variables exported within the makefile to their environment.
 LC_ALL=C
 export LC_ALL