macro: Introduce ABS() macro and use it in header files

abs() requires including the entirety of stdlib.h just for a single
trivial function. Let's introduce the ABS() macro and use it in header
files instead so we can get rid of stdlib.h transitive includes in header
files in a later commit.

src/cryptsetup/cryptsetup-tokens/cryptsetup-token-util.h

@@ -6,6 +6,8 @@
 #include <stdbool.h>
 #include <stddef.h>
 
+#include "macro.h"
+
 /* crypt_dump() internal indentation magic */
 #define CRYPT_DUMP_LINE_SEP "\n\t            "
 
@@ -15,7 +17,7 @@
 #define crypt_log(cd, ...)         crypt_logf(cd, CRYPT_LOG_NORMAL,  __VA_ARGS__)
 
 #define crypt_log_full_errno(cd, e, lvl, ...) ({ \
-        int _e = abs(e), _s = errno; \
+        int _e = ABS(e), _s = errno; \
         errno = _e; \
         crypt_logf(cd, lvl, __VA_ARGS__); \
         errno = _s; \