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.
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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