audit/auvirt: get inline functions work with both gnu89 & gnu11

After gcc upgraded to gcc5, and if the codes are compiled without
optimization (-O0), and the below error will happen:

  auvirt.c:484: undefined reference to `copy_str'
  auvirt.c:667: undefined reference to `is_resource'
  collect2: error: ld returned 1 exit status

gcc5 defaults to -std=gnu11 instead of -std=gnu89, and it requires that
exactly one C source file has the callable copy of the inline function.
Consider the following program:

  inline int
  foo (void)
  {
    return 42;
  }

  int
  main (void)
  {
    return foo ();
  }

The program above will not link with the C99 inline semantics, because
no out-of-line function foo is generated. To fix this, either mark the
function foo as static, or add the following declaration:

  static inline int foo (void);

More information refer to: https://gcc.gnu.org/gcc-5/porting_to.html

Note: using "extern inline" will fail to build with gcc4.x, so replace
inline with "static inline".

Signed-off-by: Wenzong Fan <wenzong.fan@windriver.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>

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