Provide abs form stdlib.h.

Sponsored by: Netflix

stand/libsa/Makefile

@@ -37,6 +37,11 @@ SRCS+=	bcmp.c bcopy.c bzero.c ffs.c fls.c \
 	qdivrem.c strcat.c strchr.c strcmp.c strcpy.c stpcpy.c stpncpy.c \
 	strcspn.c strlcat.c strlcpy.c strlen.c strncat.c strncmp.c strncpy.c \
 	strnlen.c strpbrk.c strrchr.c strsep.c strspn.c strstr.c strtok.c swab.c
+
+# stdlib functions from libc
+.PATH: ${LIBC_SRC}/stdlib
+SRCS+=	abs.c
+
 .if ${MACHINE_CPUARCH} == "arm"
 .PATH: ${LIBC_SRC}/arm/gen
 

stand/libsa/stand.h

@@ -347,6 +347,7 @@ extern ev_sethook_t	env_noset;		/* refuse set operation */
 extern ev_unsethook_t	env_nounset;		/* refuse unset operation */
 
 /* stdlib.h routines */
+extern int		abs(int a);
 extern void		abort(void);
 
 /* BCD conversions (undocumented) */