general code cleanup on lbmk shell scripts

in update/blobs/download, i saw instances where
appdir was being deleted with rm -r, but the more
appropriate command would rm -Rf. this is now fixed.

other than that, i've mostly just simplified a bunch
of if statements and consolidated some duplicated
logic (e.g. if/else block for dependencies in
build_dependencies() of update/blobs/download

one or two functions and/or variables have been
renamed, for greater clarity in the code, also
removed a few messages that were redundant

used printf instead of echo, in a few places, also
fixed up the indentation in a few places

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

resources/scripts/misc/versioncheck

@@ -20,24 +20,20 @@
 set -u -e
 
 version="version-unknown"
-if [ -f version ]; then
-	version="$(cat version)"
-fi
+[ -f version ] && version="$(cat version)"
 version_="${version}"
 if [ -e ".git" ]; then
-	version="$(git describe --tags HEAD 2>&1)" \
-	|| version="git-$(git rev-parse HEAD 2>&1)" \
-	|| version="${version_}"
+	version="$(git describe --tags HEAD 2>&1)" || \
+	    version="git-$(git rev-parse HEAD 2>&1)" || \
+	    version="${version_}"
 	printf "%s\n" "${version}" > version
 fi
 
 versiondate="version-date-unknown"
-if [ -f versiondate ]; then
-	versiondate="$(cat versiondate)"
-fi
+[ -f versiondate ] && versiondate="$(cat versiondate)"
 versiondate_="${versiondate}"
 if [ -e ".git" ]; then
-	versiondate="$(git show --no-patch --no-notes --pretty='%ct' HEAD)" \
-	|| versiondate="${versiondate_}"
+	versiondate="$(git show --no-patch --no-notes --pretty='%ct' HEAD)" || \
+	    versiondate="${versiondate_}"
 	printf "%s\n" "${versiondate}" > versiondate
 fi