bfd/COFF: properly mark bfd_coff_{gc_sections,group_name}() as private

Add an underscore prefix and make them hidden.

bfd/coffcode.h

diff --git a/bfd/coffcode.h b/bfd/coffcode.h
index ce1e391..81ba944 100644
--- a/bfd/coffcode.h
+++ b/bfd/coffcode.h
@@ -6017,7 +6017,7 @@
 #endif
 
 #ifndef coff_bfd_gc_sections
-#define coff_bfd_gc_sections		    bfd_coff_gc_sections
+#define coff_bfd_gc_sections		    _bfd_coff_gc_sections
 #endif
 
 #ifndef coff_bfd_lookup_section_flags
@@ -6029,7 +6029,7 @@
 #endif
 
 #ifndef coff_bfd_group_name
-#define coff_bfd_group_name		    bfd_coff_group_name
+#define coff_bfd_group_name		    _bfd_coff_group_name
 #endif
 
 #ifndef coff_bfd_discard_group

bfd/coffgen.c

diff --git a/bfd/coffgen.c b/bfd/coffgen.c
index 071ca0d..a851a22 100644
--- a/bfd/coffgen.c
+++ b/bfd/coffgen.c
@@ -3246,7 +3246,7 @@
 /* Do mark and sweep of unused sections.  */
 
 bool
-bfd_coff_gc_sections (bfd *abfd ATTRIBUTE_UNUSED, struct bfd_link_info *info)
+_bfd_coff_gc_sections (bfd *abfd ATTRIBUTE_UNUSED, struct bfd_link_info *info)
 {
   bfd *sub;
 
@@ -3296,7 +3296,7 @@
 /* Return name used to identify a comdat group.  */
 
 const char *
-bfd_coff_group_name (bfd *abfd, const asection *sec)
+_bfd_coff_group_name (bfd *abfd, const asection *sec)
 {
   struct coff_comdat_info *ci = bfd_coff_get_comdat_section (abfd, sec);
   if (ci != NULL)

bfd/libcoff-in.h

diff --git a/bfd/libcoff-in.h b/bfd/libcoff-in.h
index d7efcff..88f5760 100644
--- a/bfd/libcoff-in.h
+++ b/bfd/libcoff-in.h
@@ -641,10 +641,10 @@
 extern bool _bfd_coff_reloc_link_order
   (bfd *, struct coff_final_link_info *, asection *,
    struct bfd_link_order *) ATTRIBUTE_HIDDEN;
-extern bool bfd_coff_gc_sections
-  (bfd *, struct bfd_link_info *);
-extern const char *bfd_coff_group_name
-  (bfd *, const asection *);
+extern bool _bfd_coff_gc_sections
+  (bfd *, struct bfd_link_info *) ATTRIBUTE_HIDDEN;
+extern const char *_bfd_coff_group_name
+  (bfd *, const asection *) ATTRIBUTE_HIDDEN;
 
 /* Functions in xcofflink.c.  */
 

bfd/libcoff.h

diff --git a/bfd/libcoff.h b/bfd/libcoff.h
index 9d9ee18..d2d5501 100644
--- a/bfd/libcoff.h
+++ b/bfd/libcoff.h
@@ -645,10 +645,10 @@
 extern bool _bfd_coff_reloc_link_order
   (bfd *, struct coff_final_link_info *, asection *,
    struct bfd_link_order *) ATTRIBUTE_HIDDEN;
-extern bool bfd_coff_gc_sections
-  (bfd *, struct bfd_link_info *);
-extern const char *bfd_coff_group_name
-  (bfd *, const asection *);
+extern bool _bfd_coff_gc_sections
+  (bfd *, struct bfd_link_info *) ATTRIBUTE_HIDDEN;
+extern const char *_bfd_coff_group_name
+  (bfd *, const asection *) ATTRIBUTE_HIDDEN;
 
 /* Functions in xcofflink.c.  */