Removed references to '(-march|-mtune|-mcpu)=native' (#12948)

Now that Spack injects microarchitecture specific optimizations for
the selected target, packages should avoid adding flags that could
step over those.

var/spack/repos/tutorial/packages/elpa/package.py

@@ -65,13 +65,10 @@ def configure_args(self):
         # https://src.fedoraproject.org/cgit/rpms/elpa.git/
         # https://packages.qa.debian.org/e/elpa.html
         options = []
-        # without -march=native there is configure error for 2017.05.02
-        # Could not compile test program, try with --disable-sse, or
-        # adjust the C compiler or CFLAGS
         if '+optflags' in self.spec:
             options.extend([
-                'FCFLAGS=-O2 -march=native -ffree-line-length-none',
-                'CFLAGS=-O2 -march=native'
+                'FCFLAGS=-O2 -ffree-line-length-none',
+                'CFLAGS=-O2'
             ])
         if '+openmp' in self.spec:
             options.append('--enable-openmp')