When the buildkernel stage 2.3 (build tools) runs, the PATH is still set

to the default from the top-level Makefile.  Therefore, invocations of
lex and yacc (used during building of aicasm) will use the executables
in /usr/bin, not those optionally built during the previous buildworld
or kernel-toolchain.  This makes kernel builds from older FreeBSD
releases more difficult than necessary.

Fix this by setting PATH to ${BPATH}:${PATH} in stage 2.3, so the
bootstrap tools directories are searched before the regular ones.

Silence from:	svn-src-{all,head}
MFC after:	1 week

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