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Diff for as.h in gas to compile on hpux

The change is actually neither mips nor hpux specific: notably,
the assert-mask had an odd-format I did not understand:

#define assert(p) ((P) ? 0 : (as_assert (...)))

which meant it evaluated to be 0, or the return of as_assert(),
instead of void.

The hp-ux 9.05 c-compiler did not like one of the uses of this,
which became:

 (blah) ? 0 : as_assert();

 or 0; after optimisation

The following diff against as.h just changes the assert macro
to be an if statement.

*** as.h@@/main/LATEST	Fri Mar 22 11:44:19 1996
--- as.h	Mon May 13 17:25:50 1996
*** 121,127 ****
! #define assert(P) ((P) ? 0 : (as_assert (__FILE__, __LINE__, __PRETTY_FUNCTION__), 0))
  #undef abort
  #define abort()		as_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
--- 121,127 ----
! #define assert(P) if (P) (as_assert (__FILE__, __LINE__, __PRETTY_FUNCTION__), 0)
  #undef abort
  #define abort()		as_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)

 Don Bowman        **     **           519-883-3019