remove internal reallocarray()

... as it's covered by libbpf_reallocarray() since commit dc70da9c70.

include/tools/libc_compat.h

@@ -1,20 +0,0 @@
-// SPDX-License-Identifier: (LGPL-2.0+ OR BSD-2-Clause)
-/* Copyright (C) 2018 Netronome Systems, Inc. */
-
-#ifndef __TOOLS_LIBC_COMPAT_H
-#define __TOOLS_LIBC_COMPAT_H
-
-#include <stdlib.h>
-#include <linux/overflow.h>
-
-#ifdef COMPAT_NEED_REALLOCARRAY
-static inline void *reallocarray(void *ptr, size_t nmemb, size_t size)
-{
-	size_t bytes;
-
-	if (unlikely(check_mul_overflow(nmemb, size, &bytes)))
-		return NULL;
-	return realloc(ptr, bytes);
-}
-#endif
-#endif

scripts/check-reallocarray.sh

@@ -1,19 +0,0 @@
-#!/bin/sh
-# Usage: check-reallocarray.sh cc_path [cc_args...]
-
-tfile=$(mktemp /tmp/test_reallocarray_XXXXXXXX.c)
-ofile=${tfile%.c}.o
-
-cat > $tfile <<EOL
-#define _GNU_SOURCE
-#include <stdlib.h>
-
-int main(void)
-{
-	return !!reallocarray(NULL, 1, 1);
-}
-EOL
-
-"$@" $tfile -o $ofile >/dev/null 2>&1
-if [ $? -ne 0 ]; then echo "FAIL"; fi
-/bin/rm -f $tfile $ofile

scripts/sync-kernel.sh

@@ -45,7 +45,6 @@ PATH_MAP=(									\
 	[tools/include/uapi/linux/if_link.h]=include/uapi/linux/if_link.h	\
 	[tools/include/uapi/linux/if_xdp.h]=include/uapi/linux/if_xdp.h		\
 	[tools/include/uapi/linux/netlink.h]=include/uapi/linux/netlink.h	\
-	[tools/include/tools/libc_compat.h]=include/tools/libc_compat.h		\
 )
 
 LIBBPF_PATHS="${!PATH_MAP[@]} :^tools/lib/bpf/Makefile :^tools/lib/bpf/Build :^tools/lib/bpf/.gitignore"

src/Makefile

@@ -10,11 +10,6 @@ TOPDIR = ..
 INCLUDES := -I. -I$(TOPDIR)/include -I$(TOPDIR)/include/uapi
 ALL_CFLAGS := $(INCLUDES)
 
-FEATURE_REALLOCARRAY := $(shell $(TOPDIR)/scripts/check-reallocarray.sh $(CC))
-ifneq ($(FEATURE_REALLOCARRAY),)
-	ALL_CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
-endif
-
 SHARED_CFLAGS += -fPIC -fvisibility=hidden -DSHARED
 
 CFLAGS ?= -g -O2 -Werror -Wall