make: add GNU make and ninja build system

Currently only works for shared, single-library, and gcc-compatible
compilers. The Fortran modules are a soup of circular dependencies,
which make warns lo

make: add GNU make and ninja build system

Currently only works for shared, single-library, and gcc-compatible
compilers. The Fortran modules are a soup of circular dependencies,
which make warns loudly about.

make -f gmakefile PETSC_ARCH=your-arch -j10

This requires GNU make version 3.81 or later.

For Ninja [1], the entire file is generated in the build directory, so run

conf/gmakegen.py PETSC_ARCH=your-arch --output=ninja
ninja -C $PETSC_ARCH

The Ninja build does not yet support C++.

[1] http://martine.github.io/ninja/

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