Work around LLVM bug 34980

Clang generates an internal failure if the same function
has different target attributes in definition and declaration.
To work around that, we made a proxy predeclared function
without target attribute.

sshsh256.c

@@ -440,7 +440,7 @@ int main(void) {
    https://github.com/noloader/SHA-Intrinsics
 */
 FUNC_ISA
-static void SHA256_ni(SHA256_State * s, const unsigned char *q, int len) {
+static void SHA256_ni_(SHA256_State * s, const unsigned char *q, int len) {
     if (s->blkused && s->blkused+len < BLKSIZE) {
         /*
          * Trivial case: just add to the block.
@@ -647,6 +647,14 @@ static void SHA256_ni(SHA256_State * s, const unsigned char *q, int len) {
     }
 }
 
+/*
+ * Workaround LLVM bug https://bugs.llvm.org/show_bug.cgi?id=34980
+ */
+static void SHA256_ni(SHA256_State * s, const unsigned char *q, int len)
+{
+    SHA256_ni_(s, q, len);
+}
+
 #else /* COMPILER_SUPPORTS_AES_NI */
 
 static void SHA256_ni(SHA256_State * s, const unsigned char *q, int len)

sshsha.c

@@ -521,7 +521,7 @@ int supports_sha_ni(void)
    https://github.com/noloader/SHA-Intrinsics
 */
 FUNC_ISA
-static void sha1_ni(SHA_State * s, const unsigned char *q, int len)
+static void sha1_ni_(SHA_State * s, const unsigned char *q, int len)
 {
     if (s->blkused && s->blkused + len < 64) {
       /*
@@ -725,6 +725,14 @@ static void sha1_ni(SHA_State * s, const unsigned char *q, int len)
     }
 }
 
+/*
+ * Workaround LLVM bug https://bugs.llvm.org/show_bug.cgi?id=34980
+ */
+static void sha1_ni(SHA_State * s, const unsigned char *q, int len)
+{
+    sha1_ni_(s, q, len);
+}
+
 #else /* COMPILER_SUPPORTS_AES_NI */
 
 static void sha1_ni(SHA_State * s, const unsigned char *q, int len)