Let configure detect OPENMP_FCFLAGS #115
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Resolves #114
Correctly detect OpenMP Fortran compiler flags as opposed to assuming they are the same as the C++ compiler (which breaks when matching compilers are not used, e.g. nagfor and gcc/g++). For details see autoconf AC_OPENMP docs:
https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.71/html_node/Generic-Compiler-Characteristics.html
Also remove the obsolete AC_PROG_CC_C99 macro:
https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.71/html_node/Obsolete-Macros.html#index-AC_005fPROG_005fCC_005fC99-1