x86, modpost: Replace last remnants of RETPOLINE with CONFIG_RETPOLINE

Commit

  4cd24de3a098 ("x86/retpoline: Make CONFIG_RETPOLINE depend on compiler support")

replaced the RETPOLINE define with CONFIG_RETPOLINE checks. Remove the
remaining pieces.

 [ bp: Massage commit message. ]

Fixes: 4cd24de3a098 ("x86/retpoline: Make CONFIG_RETPOLINE depend on compiler support")
Signed-off-by: WANG Chao <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Reviewed-by: Zhenzhong Duan <[email protected]>
Reviewed-by: Masahiro Yamada <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Daniel Borkmann <[email protected]>
Cc: David Woodhouse <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Jessica Yu <[email protected]>
Cc: Jiri Kosina <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: Luc Van Oostenryck <[email protected]>
Cc: Michal Marek <[email protected]>
Cc: Miguel Ojeda <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Tim Chen <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: stable <[email protected]>
Cc: x86-ml <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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