Fix the ppc bn_mul_mont() to use the new prefix system

The symbol prefix changes that began in commit 384f7d0 require
that cpu-ppc.c finds the generated prefix header and that bigint.rs
looks for the correctly prefixed bn_mul_mont().

Signed-off-by: Russell Currey <ruscur@russell.cc>

crypto/cpu-ppc.c

@@ -8,13 +8,14 @@
  */
 /* This file is derived from ppccap.c in OpenSSL */
 
-
+// Must be included for bn_mul_mont to have the correct symbol
+#include <ring-core/base.h>
 
 int bn_mul_mont_int(unsigned long *rp, const unsigned long *ap, const unsigned long *bp,
                     const unsigned long *np, const unsigned long *n0, int num);
 int bn_mul4x_mont_int(unsigned long *rp, const unsigned long *ap, const unsigned long *bp,
                       const unsigned long *np, const unsigned long *n0, int num);
-int GFp_bn_mul_mont(unsigned long *rp, const unsigned long *ap, const unsigned long *bp,
+int bn_mul_mont(unsigned long *rp, const unsigned long *ap, const unsigned long *bp,
                 const unsigned long *np, const unsigned long *n0, int num)
 {
     if (num < 4)

src/arithmetic/bigint.rs

@@ -1381,7 +1381,8 @@ fn limbs_mont_square(r: &mut [Limb], m: &[Limb], n0: &N0, _cpu_features: cpu::Fe
     target_arch = "aarch64",
     target_arch = "arm",
     target_arch = "x86_64",
-    target_arch = "x86"
+    target_arch = "x86",
+    target_arch = "powerpc64"
 ))]
 prefixed_extern! {
     // `r` and/or 'a' and/or 'b' may alias.