Add makepkg settings as separate file

arch-config/etc/makepkg.conf.d/performance.conf

@@ -0,0 +1,18 @@
+#!/hint/bash
+# shellcheck disable=2034
+
+# build for native architecture
+CFLAGS="-march=native -mtune=generic -O2 -pipe -fno-plt -fexceptions \
+        -Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security \
+        -fstack-clash-protection -fcf-protection \
+        -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer"
+
+RUSTFLAGS="-C opt-level=3 -C target-cpu=native"
+
+# use all cores
+MAKEFLAGS="-j$(nproc)"
+
+# build in RAM
+BUILDDIR=/tmp/makepkg
+
+# vim: set ft=sh ts=2 sw=2 et: