Add _PG_init prototype

While at it, move PG_MODULE_MAGIC into the file that has _PG_init.

Author: df7cb

pg_pwhash.c

@@ -11,10 +11,12 @@
 #include "pwhash_argon2.h"
 #include "pwhash_yescrypt.h"
 
+PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(pwhash_test_options);
 PG_FUNCTION_INFO_V1(xgen_salt);
 PG_FUNCTION_INFO_V1(pgxcrypt_crypt);
 PG_FUNCTION_INFO_V1(xcrypt);
+void PGDLLEXPORT _PG_init(void);
 
 #if PG_VERSION_NUM < 180000
 #define PWHASH_PGB64_t char *
@@ -624,4 +626,4 @@ _PG_init(void)
 							 NULL);
 
 
-}
+}

pwhash_scrypt.c

@@ -20,8 +20,6 @@
 #include "libscrypt.h"
 #endif
 
-PG_MODULE_MAGIC;
-
 #define SCRYPT_WORK_FACTOR_N 16
 #define SCRYPT_BLOCK_SIZE_r 8
 #define SCRYPT_PARALLEL_FACTOR_p 1