initial empty check-in
initial import of MPC 0.9 package.

MPC is a C library for the arithmetic of complex numbers with
arbitrarily high precision and correct rounding of the result.
It is built upon and follows the same principles as MPFR.

GCC >= 4.2 requires MPC.
initial import of MPC 1.0.1 package.  changes since 0.9:

Changes in version 1.0.1:
  - Switched to automake 1.11.6, see
    https://lists.gnu.org/archive/html/automake/2012-07/msg00023.html
  - #14669: Fixed extraction of CC from gmp.h
  - Fixed case of intermediate zero real or imaginary part in mpc_fma,
    found by hydra with GMP_CHECK_RANDOMIZE=1346362345

Changes in version 1.0:
  - First release as a GNU package
  - License change: LGPLv3+ for code, GFDLv1.3+ (with no invariant sections)
    for documentation
  - 100% of all lines are covered by tests
  - Functions renamed:
    mpc_mul_2exp to mpc_mul_2ui, mpc_div_2exp to mpc_div_2ui
  - 0^0, which returned (NaN,NaN) previously, now returns (1,+0)
  - Removed compatibility with K&R compilers, untestable due to lack of
    such compilers
  - New functions: mpc_log10, mpc_mul_2si, mpc_div_2si
  - Speed-ups:
    - mpc_fma
  - Bug fixes:
    - mpc_div and mpc_norm now return a value indicating the effective
      rounding direction, as the other functions
    - mpc_mul, mpc_sqr and mpc_norm now return correct results even if there
      are over- or underflows during the computation
    - mpc_asin, mpc_proj, mpc_sqr: Wrong result when input variable has
      infinite part and equals output variable is corrected
    - mpc_fr_sub: Wrong return value for imaginary part is corrected