Rename curve25519/ref10 files to avoid duplicate file names.

Sharing code between curve25519 and ed25519 would be way better, but
until then, having distinct file names is required for Cocoapods, and makes
things easier in Visual Studio.

src/libsodium/Makefile.am

@@ -209,23 +209,23 @@ libsodium_la_SOURCES += \
 else
 libsodium_la_SOURCES += \
 	crypto_scalarmult/curve25519/ref10/api.h \
-	crypto_scalarmult/curve25519/ref10/base.c \
+	crypto_scalarmult/curve25519/ref10/base_curve25519_ref10.c \
 	crypto_scalarmult/curve25519/ref10/fe.h \
-	crypto_scalarmult/curve25519/ref10/fe_0.c \
-	crypto_scalarmult/curve25519/ref10/fe_1.c \
-	crypto_scalarmult/curve25519/ref10/fe_add.c \
-	crypto_scalarmult/curve25519/ref10/fe_copy.c \
-	crypto_scalarmult/curve25519/ref10/fe_cswap.c \
-	crypto_scalarmult/curve25519/ref10/fe_frombytes.c \
-	crypto_scalarmult/curve25519/ref10/fe_invert.c \
-	crypto_scalarmult/curve25519/ref10/fe_mul.c \
-	crypto_scalarmult/curve25519/ref10/fe_mul121666.c \
-	crypto_scalarmult/curve25519/ref10/fe_sq.c \
-	crypto_scalarmult/curve25519/ref10/fe_sub.c \
-	crypto_scalarmult/curve25519/ref10/fe_tobytes.c \
+	crypto_scalarmult/curve25519/ref10/fe_0_curve25519_ref10.c \
+	crypto_scalarmult/curve25519/ref10/fe_1_curve25519_ref10.c \
+	crypto_scalarmult/curve25519/ref10/fe_add_curve25519_ref10.c \
+	crypto_scalarmult/curve25519/ref10/fe_copy_curve25519_ref10.c \
+	crypto_scalarmult/curve25519/ref10/fe_cswap_curve25519_ref10.c \
+	crypto_scalarmult/curve25519/ref10/fe_frombytes_curve25519_ref10.c \
+	crypto_scalarmult/curve25519/ref10/fe_invert_curve25519_ref10.c \
+	crypto_scalarmult/curve25519/ref10/fe_mul_curve25519_ref10.c \
+	crypto_scalarmult/curve25519/ref10/fe_mul121666_curve25519_ref10.c \
+	crypto_scalarmult/curve25519/ref10/fe_sq_curve25519_ref10.c \
+	crypto_scalarmult/curve25519/ref10/fe_sub_curve25519_ref10.c \
+	crypto_scalarmult/curve25519/ref10/fe_tobytes_curve25519_ref10.c \
 	crypto_scalarmult/curve25519/ref10/montgomery.h \
 	crypto_scalarmult/curve25519/ref10/pow225521.h \
-	crypto_scalarmult/curve25519/ref10/scalarmult.c
+	crypto_scalarmult/curve25519/ref10/scalarmult_curve25519_ref10.c
 endif
 
 if HAVE_AMD64_ASM