restore declaration of deisogenize which was causing build failure in gcc

src/GENERATED/c/curve25519/decaf.c

@@ -119,6 +119,15 @@ static mask_t gf_lobit(const gf x) {
 /** identity = (0,1) */
 const point_t API_NS(point_identity) = {{{{{0}}},{{{1}}},{{{1}}},{{{0}}}}};
 
+void API_NS(deisogenize) (
+    gf_s *__restrict__ s,
+    gf_s *__restrict__ minus_t_over_s,
+    const point_t p,
+    mask_t toggle_hibit_s,
+    mask_t toggle_hibit_t_over_s,
+    mask_t toggle_rotation
+);
+
 void API_NS(deisogenize) (
     gf_s *__restrict__ s,
     gf_s *__restrict__ minus_t_over_s,
@@ -1411,7 +1420,13 @@ void decaf_x25519_derive_public_key (
     point_t p;
     API_NS(precomputed_scalarmul)(p,API_NS(precomputed_base),the_scalar);
     
-    /* Isogenize to Montgomery curve */
+    /* Isogenize to Montgomery curve.
+     *
+     * Why isn't this just a separate function, eg decaf_encode_like_x25519?
+     * Basically because in general it does the wrong thing if there is a cofactor
+     * component in the input.  In this function though, there isn't a cofactor
+     * component in the input.
+     */
     gf_invert(p->t,p->x); /* 1/x */
     gf_mul(p->z,p->t,p->y); /* y/x */
     gf_sqr(p->y,p->z); /* (y/x)^2 */

src/GENERATED/c/ed448goldilocks/decaf.c

@@ -119,6 +119,15 @@ static mask_t gf_lobit(const gf x) {
 /** identity = (0,1) */
 const point_t API_NS(point_identity) = {{{{{0}}},{{{1}}},{{{1}}},{{{0}}}}};
 
+void API_NS(deisogenize) (
+    gf_s *__restrict__ s,
+    gf_s *__restrict__ minus_t_over_s,
+    const point_t p,
+    mask_t toggle_hibit_s,
+    mask_t toggle_hibit_t_over_s,
+    mask_t toggle_rotation
+);
+
 void API_NS(deisogenize) (
     gf_s *__restrict__ s,
     gf_s *__restrict__ minus_t_over_s,
@@ -1411,7 +1420,13 @@ void decaf_x448_derive_public_key (
     point_t p;
     API_NS(precomputed_scalarmul)(p,API_NS(precomputed_base),the_scalar);
     
-    /* Isogenize to Montgomery curve */
+    /* Isogenize to Montgomery curve.
+     *
+     * Why isn't this just a separate function, eg decaf_encode_like_x448?
+     * Basically because in general it does the wrong thing if there is a cofactor
+     * component in the input.  In this function though, there isn't a cofactor
+     * component in the input.
+     */
     gf_invert(p->t,p->x); /* 1/x */
     gf_mul(p->z,p->t,p->y); /* y/x */
     gf_sqr(p->y,p->z); /* (y/x)^2 */

src/per_curve/decaf.tmpl.c

@@ -108,6 +108,15 @@ static mask_t gf_lobit(const gf x) {
 /** identity = (0,1) */
 const point_t API_NS(point_identity) = {{{{{0}}},{{{1}}},{{{1}}},{{{0}}}}};
 
+void API_NS(deisogenize) (
+    gf_s *__restrict__ s,
+    gf_s *__restrict__ minus_t_over_s,
+    const point_t p,
+    mask_t toggle_hibit_s,
+    mask_t toggle_hibit_t_over_s,
+    mask_t toggle_rotation
+);
+
 void API_NS(deisogenize) (
     gf_s *__restrict__ s,
     gf_s *__restrict__ minus_t_over_s,