advapi32: Declare a function static

[Andrew Talbot]

Changelog:
    advapi32: Declare a function static.

diff --git a/dlls/advapi32/crypt.h b/dlls/advapi32/crypt.h
index 8fb5139..3d630da 100644
--- a/dlls/advapi32/crypt.h
+++ b/dlls/advapi32/crypt.h
@@ -82,7 +82,6 @@ typedef struct tagCRYPTHASH
 
 #define MAXPROVTYPES 999
 
-extern unsigned char *CRYPT_DESkey8to7( unsigned char *dst, const unsigned char *key );
 extern unsigned char *CRYPT_DEShash( unsigned char *dst, const unsigned char *key,
                                      const unsigned char *src );
 extern unsigned char *CRYPT_DESunhash( unsigned char *dst, const unsigned char *key,
diff --git a/dlls/advapi32/crypt_des.c b/dlls/advapi32/crypt_des.c
index 840eb1b..b980ab1 100644
--- a/dlls/advapi32/crypt_des.c
+++ b/dlls/advapi32/crypt_des.c
@@ -252,7 +252,7 @@ static void xor( unsigned char *dst, const unsigned char *a, const unsigned char
         dst[i] = a[i] ^ b[i];
 }
 
-unsigned char *CRYPT_DESkey8to7( unsigned char *dst, const unsigned char *key )
+static unsigned char *CRYPT_DESkey8to7( unsigned char *dst, const unsigned char *key )
 {
     int i;
     unsigned char tmp[7];