[ipxe-devel] [ipxe/ipxe] fix EMBED: don't eagerly assign over non-empty value (#115)

[realtime-neil]

Found it:

> Any target in the makefile may be specified as a goal (unless it starts with ‘-’ or contains an ‘=’, in which case it will be parsed as a switch or variable definition, respectively).
-- https://www.gnu.org/software/make/manual/make.html#Goals

I make my living on exactly this kind of minutia, but IMHO, one parenthetical clause in the `make` manual is too little reason to flout the principle of least surprise.

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