Avoid non-portable use of $< outside an inference rule.

[mmh] / ChangeLog

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+2005-12-24  Peter Maydell  <pmaydell@chiark.greenend.org.uk>
+
+       * Bug #15285: Don't use $< in target rules in makefiles, as POSIX
+       says it's only defined in inference rules. (BSD make was expanding
+       $< to the empty string in the rule for building sbr/dtimep.c, which
+       causes lex to apparently hang because it's reading from stdin.)
+
 2005-12-24  Peter Maydell  <pmaydell@chiark.greenend.org.uk>
 
        * Completely redo db library checking -- we now check for working