Remove -march=native from build flags.

--- a/higan/GNUmakefile
+++ b/higan/GNUmakefile
@@ -32,7 +32,7 @@ ifeq ($(platform),windows)
 else ifeq ($(platform),macosx)
   flags += -march=native
 else ifneq ($(filter $(platform),linux bsd),)
-  flags += -march=native -fopenmp
+  flags += -fopenmp
   link += -fopenmp
   link += -Wl,-export-dynamic
   link += -lX11 -lXext
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<tr><td><span title='2022-03-01 13:18:01 -0500'>2022-03-01</span></td><td><a href='/guix/commit/CODE-OF-CONDUCT?id=c67912011154e2b347cdf6f3e633e87fd44f409c'>CODE-OF-CONDUCT: Add a top notice.</a><span class='msg-avail'>...<span class='msg-tooltip'>* CODE-OF-CONDUCT: Add a top notice.
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<tr><td><span title='2022-03-01 13:07:04 -0500'>2022-03-01</span></td><td><a href='/guix/commit/CODE-OF-CONDUCT?id=4254d74b4ca6d4aa78b7fa055fc9ec72a2e93ad3'>CODE-OF-CONDUCT: Update to version 2.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* CODE-OF-CONDUCT: Update to version 2.1.
</span></span></td><td>Maxim Cournoyer</td></tr>