spec: update embedded RPM spec file

The embedded RPM spec file seems to be a bit out of date. Update to
match the current RPM conventions.

Signed-off-by: H. Peter Anvin <[email protected]>

Author: H. Peter Anvin

nasm.spec.in

@@ -40,7 +40,7 @@ PDF formats.
 
 %build
 sh autogen.sh
-%configure --enable-sections
+%configure --enable-gc $([ -z "%{_lto_cflags}" ] || echo --enable-lto)
 make %{?_smp_mflags} everything
 
 %install