Configurations/15-android.conf: default to RC4_CHAR whenever possible.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5613)

Configurations/15-android.conf

@@ -160,14 +160,17 @@ my %targets = (
         # -march and/or -mfloat-abi flags. NDK defaults to armv5te.
         #
         inherit_from     => [ "android", asm("armv4_asm") ],
+        bn_ops           => add("RC4_CHAR"),
     },
     "android-arm64" => {
         inherit_from     => [ "android", asm("aarch64_asm") ],
+        bn_ops           => add("RC4_CHAR"),
         perlasm_scheme   => "linux64",
     },
 
     "android-mips" => {
         inherit_from     => [ "android", asm("mips32_asm") ],
+        bn_ops           => add("RC4_CHAR"),
         perlasm_scheme   => "o32",
     },
     "android-mips64" => {
@@ -181,6 +184,7 @@ my %targets = (
         # prior versions original MIPS binary code will fail.
         #
         inherit_from     => [ "android", asm("mips64_asm") ],
+        bn_ops           => add("RC4_CHAR"),
         perlasm_scheme   => "64",
     },