much, much stricter, more verbose error handling

lbmk is much more likely to crash now, in error conditions,
which is a boon for further auditing.

also: in "fetch", remove the downloaded program
if fail() was called.

this would also be done for gnulib, when downloading
grub, but done in such a way that gnulib goes first.

where calls to err write "ERROR" in the string, they
no longer say "ERROR" because the "err" function itself
now does that automatically.

also: listmodes/listoptions (in "lbmk") now reports an
error if no scripts and/or directories are found.

also: where a warning is given, but not an error, i've
gone through in some places and redirected the output
to stderr, not stdout

as part of error checks: running anything as root, except
for the "./build dependencies *" commands, is no longer
permitted and lbmk will throw an error

mrc downloads: debugfs output no longer redirected to /dev/null,
and stderr no longer redirected to stdout. everything is verbose.

certain non-error states are also more verbose. for example,
patch_rom in blobs/inject will now state when injection succeeds

certain actual errors(bugs) were fixed:
for example, build/release/roms now correctly prepares the blobs
hash files for a given target, containing only the files and
checksums in the list. Previously, a printf message was included.
Now, with this new code: blobutil/inject rightly verifies hashes.

doing all of this in one giant patch is cleaner
than 100 patches changing each file. even this is yet part
of a much larger audit going on in the Libreboot project.

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

resources/scripts/build/grub/utils

@@ -34,12 +34,18 @@ main()
 build_grub()
 {
 	(
-	cd grub/ || err "cd"
-	[ ! -d Makefile ] || make distclean || err "make-distclean"
-	./bootstrap --gnulib-srcdir=gnulib/ --no-git || err "bootstrap"
-	./autogen.sh || err "autogen"
-	./configure --with-platform=coreboot || err "configure"
-	make -j$(nproc) || err "make"
+	cd grub/ || \
+	    err "build_grub: cd"
+	[ ! -d Makefile ] || make distclean || \
+	    err "build_grub: make-distclean"
+	./bootstrap --gnulib-srcdir=gnulib/ --no-git || \
+	    err "build_grub: gnulib bootstrap"
+	./autogen.sh || \
+	    err "build_grub: autogen.sh"
+	./configure --with-platform=coreboot || \
+	    err "build_grub: autoconf"
+	make -j$(nproc) || \
+	    err "build_grub: make"
 	)
 }