tools: include reallocarray feature test in FEATURE_TESTS_BASIC

perf propagates its feature check results to libbpf.  This means
features for which perf probes must be a superset of libbpf's
required features.  perf depends on FEATURE_TESTS_BASIC for its list
of features.

commit 531b014e ("tools: bpf: make use of reallocarray") added
reallocarray use to libbpf, make perf also perform the reallocarray
feature check.

Fixes: 531b014e ("tools: bpf: make use of reallocarray")
Reported-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com>
Tested-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>

tools/build/Makefile.feature

@@ -57,6 +57,7 @@ FEATURE_TESTS_BASIC :=                  \
         libunwind-aarch64               \
         pthread-attr-setaffinity-np     \
         pthread-barrier     		\
+        reallocarray                    \
         stackprotector-all              \
         timerfd                         \
         libdw-dwarf-unwind              \