selftests/bpf: remove unnecessary kfunc prototypes

Remove unnecessary kfunc prototypes from test programs, these are
provided by vmlinux.h

Signed-off-by: Mykyta Yatsenko <[email protected]>
Acked-by: Eduard Zingerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

Author: mykyta5

tools/testing/selftests/bpf/progs/ip_check_defrag.c

@@ -12,11 +12,6 @@
 #define IP_OFFSET		0x1FFF
 #define NEXTHDR_FRAGMENT	44
 
-extern int bpf_dynptr_from_skb(struct __sk_buff *skb, __u64 flags,
-			      struct bpf_dynptr *ptr__uninit) __ksym;
-extern void *bpf_dynptr_slice(const struct bpf_dynptr *ptr, uint32_t offset,
-			      void *buffer, uint32_t buffer__sz) __ksym;
-
 volatile int shootdowns = 0;
 
 static bool is_frag_v4(struct iphdr *iph)

tools/testing/selftests/bpf/progs/verifier_netfilter_ctx.c

@@ -79,11 +79,6 @@ int with_invalid_ctx_access_test5(struct bpf_nf_ctx *ctx)
 	return NF_ACCEPT;
 }
 
-extern int bpf_dynptr_from_skb(struct __sk_buff *skb, __u64 flags,
-                               struct bpf_dynptr *ptr__uninit) __ksym;
-extern void *bpf_dynptr_slice(const struct bpf_dynptr *ptr, uint32_t offset,
-                                   void *buffer, uint32_t buffer__sz) __ksym;
-
 SEC("netfilter")
 __description("netfilter test prog with skb and state read access")
 __success __failure_unpriv