Integrate Curve448 into the build system

Reviewed-by: NBernd Edlinger <bernd.edlinger@hotmail.de>
(Merged from https://github.com/openssl/openssl/pull/5105)

crypto/ec/build.info

@@ -6,6 +6,9 @@ SOURCE[../../libcrypto]=\
         ecp_nistp224.c ecp_nistp256.c ecp_nistp521.c ecp_nistputil.c \
         ecp_oct.c ec2_oct.c ec_oct.c ec_kmeth.c ecdh_ossl.c ecdh_kdf.c \
         ecdsa_ossl.c ecdsa_sign.c ecdsa_vrf.c curve25519.c ecx_meth.c \
+        curve448/arch_32/f_impl.c curve448/f_arithmetic.c curve448/f_generic.c \
+        curve448/scalar.c curve448/curve448_tables.c curve448/eddsa.c \
+        curve448/curve448.c \
         {- $target{ec_asm_src} -}
 
 GENERATE[ecp_nistz256-x86.s]=asm/ecp_nistz256-x86.pl \
@@ -28,3 +31,11 @@ BEGINRAW[Makefile]
 {- $builddir -}/ecp_nistz256-%.S:	{- $sourcedir -}/asm/ecp_nistz256-%.pl
 	CC="$(CC)" $(PERL) $< $(PERLASM_SCHEME) $@
 ENDRAW[Makefile]
+
+INCLUDE[curve448/arch_32/f_impl.o]=curve448/arch_32 curve448
+INCLUDE[curve448/f_arithmetic.o]=curve448/arch_32 curve448
+INCLUDE[curve448/f_generic.o]=curve448/arch_32 curve448
+INCLUDE[curve448/scalar.o]=curve448/arch_32 curve448
+INCLUDE[curve448/curve448_tables.o]=curve448/arch_32 curve448
+INCLUDE[curve448/eddsa.o]=curve448/arch_32 curve448
+INCLUDE[curve448/curve448.o]=curve448/arch_32 curve448

crypto/ec/curve448/word.h

@@ -26,7 +26,7 @@
 #if defined(__ARM_NEON__)
 #include <arm_neon.h>
 #elif defined(__SSE2__)
-    #if !defined(__GNUC__) || __clang__ || __GNUC__ >= 5 || (__GNUC__==4 && __GNUC_MINOR__ >= 4)
+    #if !defined(__GNUC__) || defined(__clang__) || __GNUC__ >= 5 || (__GNUC__==4 && __GNUC_MINOR__ >= 4)
         #include <immintrin.h>
     #else
         #include <emmintrin.h>
@@ -60,7 +60,7 @@
 
 #ifdef __ARM_NEON__
     typedef uint32x4_t vecmask_t;
-#elif __clang__
+#elif defined(__clang__)
     typedef uint64_t uint64x2_t __attribute__((ext_vector_type(2)));
     typedef int64_t  int64x2_t __attribute__((ext_vector_type(2)));
     typedef uint64_t uint64x4_t __attribute__((ext_vector_type(4)));
@@ -86,7 +86,7 @@
     typedef word_t vecmask_t __attribute__((vector_size(32)));
 #endif
 
-#if __AVX2__
+#if defined(__AVX2__)
     #define VECTOR_ALIGNED __attribute__((aligned(32)))
     typedef uint32x8_t big_register_t;
     typedef uint64x4_t uint64xn_t;
@@ -98,7 +98,7 @@
         big_register_t ret = {y,y,y,y,y,y,y,y};
         return ret;
     }
-#elif __SSE2__
+#elif defined(__SSE2__)
     #define VECTOR_ALIGNED __attribute__((aligned(16)))
     typedef uint32x4_t big_register_t;
     typedef uint64x2_t uint64xn_t;
@@ -110,7 +110,7 @@
         big_register_t ret = {y,y,y,y};
         return ret;
     }
-#elif __ARM_NEON__
+#elif defined(__ARM_NEON__)
     #define VECTOR_ALIGNED __attribute__((aligned(16)))
     typedef uint32x4_t big_register_t;
     typedef uint64x2_t uint64xn_t;
@@ -120,7 +120,8 @@
     br_set_to_mask(mask_t x) {
         return vdupq_n_u32(x);
     }
-#elif _WIN64 || __amd64__ || __X86_64__ || __aarch64__
+#elif defined(_WIN64) || defined(__amd64__) || defined(__X86_64__) \
+      || defined(__aarch64__)
     #define VECTOR_ALIGNED __attribute__((aligned(8)))
     typedef uint64_t big_register_t, uint64xn_t;
 
@@ -141,18 +142,18 @@
     }
 #endif
 
-#if __AVX2__
+#if defined(__AVX2__)
     static ossl_inline big_register_t
     br_is_zero(big_register_t x) {
         return (big_register_t)(x == br_set_to_mask(0));
     }
-#elif __SSE2__
+#elif defined(__SSE2__)
     static ossl_inline big_register_t
     br_is_zero(big_register_t x) {
         return (big_register_t)_mm_cmpeq_epi32((__m128i)x, _mm_setzero_si128());
         //return (big_register_t)(x == br_set_to_mask(0));
     }
-#elif __ARM_NEON__
+#elif defined(__ARM_NEON__)
     static ossl_inline big_register_t
     br_is_zero(big_register_t x) {
         return vceqq_u32(x,x^x);