Unify different generic PRINT_FIELD_* implementations

Unify different generic PRINT_FIELD_* implementations

Create a new header print_fields.h and move generic PRINT_FIELD_*
macros there.

* print_fields.h: New file.
* Makefile.am (strace_SOURCES): Add it.
* netlink_sock_diag.c: Include "print_fields.h".
(PRINT_FIELD_U, PRINT_FIELD_X, PRINT_FIELD_COOKIE, PRINT_FIELD_FLAGS,
PRINT_FIELD_XVAL): Move to print_fields.h file.
* quota.c: Include "print_fields.h".
(PRINT_FIELD_D): Move to print_fields.h file.
(PRINT_FIELD_U, PRINT_FIELD_X): Remove.
* statx.c: Include "print_fields.h".
(PRINT_FIELD_U): Remove.
(SYS_FUNC(statx)): Update PRINT_FIELD_U callers.
* tests/quotactl.h: Include "print_fields.h".
* tests/quotactl-xfs.c: Update callers of PRINT_FIELD_* macros.
* tests/quotactl.c: Likewise.
(PRINT_FIELD_D, PRINT_FIELD_U, PRINT_FIELD_X): Remove.
* tests/test_nlattr.h: Include "print_fields.h".
(PRINT_FIELD_U, PRINT_FIELD_X): Remove.
* tests/xstatx.c: Include "print_fields.h".
(PRINT_FIELD_U): Remove.
(print_stat): Update PRINT_FIELD_U callers.
* tests/tests.h [!STRACE_PRINTF] (STRACE_PRINTF): Define to printf.