Unexport internal crypto/asn1 functions.

A few can be made static. Move the rest of asn1_locl.h.

Update-Note: Code search says these are unused. If someone's using them,
we can reexport them.

Change-Id: Ib41fd15792b59e7a1a41fa6b7ef5297dc19f3021
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/43893
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/asn1/tasn_new.c b/crypto/asn1/tasn_new.c
index b99ed0a..dc864da 100644
--- a/crypto/asn1/tasn_new.c
+++ b/crypto/asn1/tasn_new.c
@@ -70,7 +70,9 @@
 static int asn1_item_ex_combine_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
                                     int combine);
 static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
+static int ASN1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);
 static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);
+static int ASN1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
 static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
 ASN1_VALUE *ASN1_item_new(const ASN1_ITEM *it)
@@ -219,7 +221,7 @@
-int ASN1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
+static int ASN1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
     const ASN1_ITEM *it = ASN1_ITEM_ptr(tt->item);
     int ret;
@@ -266,7 +268,7 @@
  * all the old functions.
-int ASN1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
+static int ASN1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
     ASN1_TYPE *typ;
     ASN1_STRING *str;