Made detection of GNU tar a bit more flexible.
Only use /usr/local/mysql-glibc if it actually exists


Build-tools/Do-linux-build:
  Only use the "--with-other-libc" parameter, if another libc actually
  exists at this location
Makefile.am:
  Removed hard-coded tar binary name
configure.in:
  Added check for GNU tar with various names
sql/sql_yacc.yy:
  Added semicolons to several expressions to make bison 1.31 and above
  happy when used in Yacc compatibility mode. From the bison NEWS:
  
    "Bison has always permitted actions such as { $$ = $1 }: it adds the
    ending semicolon.  Now if in Yacc compatibility mode, the semicolon
    is no longer output: one has to write { $$ = $1; }."
BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted