package/strace: reenable bpf for m68k

Kernel commit 0472301a28f ("bpf: fix uapi bpf_prog_info fields
alignment") fixed the issue causing build failure in bpf support code.
The fix has been applied to all kernel versions that are affected and
supported (v4.19, v5.1, v5.2). Enable back bpf for m68k.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/strace/strace.mk

@@ -19,12 +19,6 @@ STRACE_CONF_OPTS += st_cv_m32_mpers=no \
 	st_cv_mx32_mpers=no
 endif
 
-# struct bpf_prog_info fields offset mismatch
-# https://lists.strace.io/pipermail/strace-devel/2019-May/thread.html#8750
-ifeq ($(BR2_m68k),y)
-STRACE_CONF_OPTS += ac_cv_header_linux_bpf_h=no
-endif
-
 ifeq ($(BR2_PACKAGE_LIBUNWIND),y)
 STRACE_DEPENDENCIES += libunwind
 STRACE_CONF_OPTS += --with-libunwind