Adding support for the MUSL C library

[Torbjörn Granlund]

Josh Conner <joshconner at google.com> writes:

  diff -rdcp gmp-5.1.3/gmp-h.in gmp-5.1.3-fuchsia/gmp-h.in
  *** gmp-5.1.3/gmp-h.in 2013-09-30 03:18:28.000000000 -0700
  --- gmp-5.1.3-fuchsia/gmp-h.in 2016-11-02 15:00:44.702141626 -0700
  *************** typedef __mpq_struct *mpq_ptr;
  *** 264,270 ****
      || defined (_MSL_STDIO_H)           /* Metrowerks */          \
      || defined (_STDIO_H_INCLUDED)      /* QNX4 */ \
      || defined (_ISO_STDIO_ISO_H)       /* Sun C++ */ \
  !   || defined (__STDIO_LOADED)         /* VMS */
    #define _GMP_H_HAVE_FILE 1
    #endif
  
  --- 264,271 ----
      || defined (_MSL_STDIO_H)           /* Metrowerks */          \
      || defined (_STDIO_H_INCLUDED)      /* QNX4 */ \
      || defined (_ISO_STDIO_ISO_H)       /* Sun C++ */ \
  !   || defined (__STDIO_LOADED)         /* VMS */ \
  !   || defined (__DEFINED_FILE)         /* musl */
    #define _GMP_H_HAVE_FILE 1
    #endif

Thanks, I applied your patch (except the spurious spacing changes).
  

-- 
Torbjörn
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