Attempt to fix build break occasionally seen when building after a pull. This is sort of a brute-force fix. BK_LIBS is set various ways in various places, and the build break might have something to do with the configure cache not having the right stuff in it (maybe a tcl.m4 issue, I don't know for sure) when the Tcl tree is compiled the second time for the macosx build. The break was that the PCRE_LIBS was not being pulled from the configure cache so we got undefined symbols during the link. So I just stuck the pcre lib path in BK_LIBS; note that this is already being done elsewhere in the build.
Attempt to fix build break occasionally seen when building after
a pull. This is sort of a brute-force fix. BK_LIBS is set various
ways in various places, and the build break might have something
to do with the configure cache not having the right stuff in it
(maybe a tcl.m4 issue, I don't know for sure) when the Tcl tree
is compiled the second time for the macosx build. The break was
that the PCRE_LIBS was not being pulled from the configure cache
so we got undefined symbols during the link. So I just stuck the
pcre lib path in BK_LIBS; note that this is already being done
elsewhere in the build.

bk: 535ac1a4beYwiGAOewy-fnORnuxIuA
bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper