py-scipy: -fPIC appending trouble with gcc@10: (#31698)

`-fPIC` mandatory option squeezed by error, the
NPY_DISTUTILS_APPEND_FLAGS appears handy

Co-authored-by: duperrayp <duperrayp@u-un00s16835>

var/spack/repos/builtin/packages/py-scipy/package.py

@@ -111,6 +111,8 @@ def setup_build_environment(self, env):
         # https://github.com/scipy/scipy/issues/11611
         if self.spec.satisfies('@:1.4 %gcc@10:'):
             env.set('FFLAGS', '-fallow-argument-mismatch')
+            if self.spec.satisfies('^py-numpy@1.16:1.17'):
+                env.set('NPY_DISTUTILS_APPEND_FLAGS', '1')
 
         # Pick up Blas/Lapack from numpy
         self.spec['py-numpy'].package.setup_build_environment(env)