fix: adjust findsymbols definition to work in BSD make(1) #453
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The macro added in 8efde2d to wrap
findsymbolsand abort on failure incuded GNU make(1)-specific features ($(subst)), breaking the build on platforms using BSD make (like macOS). This removes the$(subst)call in thefindsymbolsmacro definition in favor of having thefindsymbolsscript itself output a backslash in front of the dollar signs in its hex literals.Fixes #448.