[poky] [PATCH] flex/bison: Don't hardcode M4 path

[Colin Walters]

The flex and bison configure scripts use AC_PATH_PROG to get a
full path to m4 and embed this in config.h (and then to the
generated binary), but this blows up when the m4 binary is in a
temporary staging directory.
    
Since we are always shipping GNU m4, just set M4=m4 at configure
time so we don't use a hardcoded path.
    
This is an equivalent to what already exists in autoconf.bb.

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