Fix logic error for building x86 CAST assembly

The assembly code is not PIC, so we should only try to build it
when the configuration has disabled PIC, not the other way around.

Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
(Merged from https://github.com/openssl/openssl/pull/12128)

crypto/cast/build.info

@@ -2,7 +2,7 @@ LIBS=../../libcrypto
 
 $CASTASM=c_enc.c
 # CAST assembly source is not PIC
-IF[{- !$disabled{asm} && !$disabled{pic} -}]
+IF[{- !$disabled{asm} && $disabled{pic} -}]
   $CASTASM_x86=cast-586.s
 
   # Now that we have defined all the arch specific variables, use the