Description of problem:
The latest version of libtdb broke compilation of code which use just tdb and do not include talloc

Version-Release number of selected component (if applicable):
sh$ rpm -q gcc libtdb-devel
gcc-11.1.1-6.fc35.x86_64
libtdb-devel-1.4.4-1.fc35.x86_64

How reproducible:
Deterministic

Steps to Reproduce:
1. echo "#include <tdb.h>" > test.c
2. gcc -Wall -Wextra -c test.c


Actual results:

[build@ed930d6c3308 ~]$ gcc -Wall -Wextra -c test.c
In file included from test.c:1:
/usr/include/tdb.h:162:9: error: expected ‘;’ before ‘struct’
  162 | _PUBLIC_ struct tdb_context *tdb_open(const char *name, int hash_size, int tdb_flags,
      |         ^~~~~~~
      |         ;
/usr/include/tdb.h:163:39: error: unknown type name ‘mode_t’
  163 |                       int open_flags, mode_t mode);
      |                                       ^~~~~~
/usr/include/tdb.h:209:9: error: expected ‘;’ before ‘struct’
  209 | _PUBLIC_ struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
      |         ^~~~~~~
      |         ;
/usr/include/tdb.h:210:42: error: unknown type name ‘mode_t’
  210 |                          int open_flags, mode_t mode,
      |                                          ^~~~~~
/usr/include/tdb.h:221:9: error: expected ‘;’ before ‘void’
  221 | _PUBLIC_ void tdb_set_max_dead(struct tdb_context *tdb, int max_dead);
      |         ^~~~~
      |         ;
/usr/include/tdb.h:236:9: error: expected ‘;’ before ‘int’
  236 | _PUBLIC_ int tdb_reopen(struct tdb_context *tdb);
      |         ^~~~
      |         ;
/usr/include/tdb.h:251:9: error: expected ‘;’ before ‘int’
  251 | _PUBLIC_ int tdb_reopen_all(int parent_longlived);
      |         ^~~~
      |         ;
/usr/include/tdb.h:260:9: error: expected ‘;’ before ‘void’
  260 | _PUBLIC_ void tdb_set_logging_function(struct tdb_context *tdb, const struct tdb_logging_context *log_ctx);
      |         ^~~~~
      |         ;

Expected results:
Code compiled without any error

Additional info:
The header file talloc.h contains following code

    32  #ifdef __cplusplus
    33  extern "C" {
    34  #endif
    35  
    36  /* for old gcc releases that don't have the feature test macro __has_attribute */
    37  #ifndef __has_attribute
    38  #define __has_attribute(x) 0
    39  #endif
    40  
    41  #ifndef _PUBLIC_
    42  #if __has_attribute(visibility)
    43  #define _PUBLIC_ __attribute__((visibility("default")))
    44  #else
    45  #define _PUBLIC_
    46  #endif
    47  #endif

It should be probably used in tdb.h as well