syscalls/mallinfo01: Add a basic test for mallinfo

Referring to glibc test tst-mallinfo2.c[1], add a test to test mallinfo.
Also check mallinfo in autotools.

[1]https://sourceware.org/git/?p=glibc.git;a=blob;f=malloc/tst-mallinfo2.c

Signed-off-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
Reviewed-by: Li Wang <liwang@redhat.com>
diff --git a/configure.ac b/configure.ac
index d41688f..37bafb9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -100,6 +100,7 @@
     io_uring_register \
     io_uring_enter \
     kcmp \
+    mallinfo \
     mallopt \
     mkdirat \
     mknodat \