Only minor nitpicks and tweaks

[xyproto]

Only formatting changes, nitpicks and minor tweaks:

• Let ./test.sh take the lisp executable as the first argument.
• Let $CC be specified when running make by the user but with gcc as the default (?=).
• Add .PHONY for make targets that does not produce anything.
• Strings in bash with no variable expansion can be single quoted.
• all instead of default in the Makefile (just a bit more common).
• rm -f is conventional for the clean target.
• Let CFLAGS add options to the end of the string with +=.
• name() { is shorter than function name {, and more compatible with the syntax of other shells than bash, should that ever be a wish.
• wc $^ is shorter.