package/rng-tools: fix uclibc build

Fix the following uclibc build failure on aarch64 raised since bump to
version 6.14 in commit 5292d1cf9ad0605cc264fedc75c1b9a169aa183b and
https://github.com/nhorman/rng-tools/commit/9070a04adfcd21ec3839ee8ff190e7130ccd5c9b:

rngd_rndr.c:34:10: fatal error: sys/auxv.h: No such file or directory
   34 | #include <sys/auxv.h>
      |          ^~~~~~~~~~~~

Strangely enough, there is no autobuilder failure for powerpc64le raised
since version bump to version 6.11 in commit
da83261c9be0484924c845bb033e2ca752556504

Fixes:
 - http://autobuild.buildroot.org/results/41d5ab9e67eb0d8af8d789fc94d4366f130a7fb2

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 5874667922ca4d83994fd9649ea91d28be5a6042)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/rng-tools/0001-configure.ac-fix-build-without-sys-auxv.h.patch

@@ -0,0 +1,52 @@
+From 6ea89861c300a732d1bbcffd085d92f5c4c9228e Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Mon, 15 Aug 2022 11:57:21 +0200
+Subject: [PATCH] configure.ac: fix build without sys/auxv.h
+
+Fix the following build failure on aarch64 without sys/auxv.h (e.g. on
+uclibc) raised since version 6.13 and
+https://github.com/nhorman/rng-tools/commit/9070a04adfcd21ec3839ee8ff190e7130ccd5c9b:
+
+rngd_rndr.c:34:10: fatal error: sys/auxv.h: No such file or directory
+   34 | #include <sys/auxv.h>
+      |          ^~~~~~~~~~~~
+
+The same issue could be raised on powerpc64le since version 6.11 and
+https://github.com/nhorman/rng-tools/commit/ade348cdb90c25b44b203fd4e9c33ec4bccff323
+
+Fixes:
+ - http://autobuild.buildroot.org/results/41d5ab9e67eb0d8af8d789fc94d4366f130a7fb2
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Retrieved from:
+https://github.com/nhorman/rng-tools/commit/6ea89861c300a732d1bbcffd085d92f5c4c9228e]
+---
+ configure.ac | 11 +++++++----
+ 1 file changed, 7 insertions(+), 4 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index 0af64e7..411c7b8 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -76,14 +76,17 @@ AC_PROG_GCC_TRADITIONAL
+ 
+ AX_PTHREAD
+ 
++dnl Checks for header files.
++AC_CHECK_HEADERS(sys/auxv.h)
++
+ AM_CONDITIONAL([RDRAND], [test $host_cpu = x86_64 || test $host_cpu = i686])
+ AS_IF([test $host_cpu = x86_64 || test $host_cpu = i686], [AC_DEFINE([HAVE_RDRAND],1,[Enable RDRAND])],[])
+ 
+-AM_CONDITIONAL([DARN], [test $host_cpu = powerpc64le])
+-AS_IF([test $host_cpu = powerpc64le], [AC_DEFINE([HAVE_DARN],1,[Enable DARN])],[])
++AM_CONDITIONAL([DARN], [test $host_cpu = powerpc64le -a "$ac_cv_header_sys_auxv_h" = "yes"])
++AS_IF([test $host_cpu = powerpc64le -a "$ac_cv_header_sys_auxv_h" = "yes"], [AC_DEFINE([HAVE_DARN],1,[Enable DARN])],[])
+ 
+-AM_CONDITIONAL([RNDR], [test $host_cpu = aarch64])
+-AS_IF([test $host_cpu = aarch64], [AC_DEFINE([HAVE_RNDR],1,[Enable RNDR])],[])
++AM_CONDITIONAL([RNDR], [test $host_cpu = aarch64 -a "$ac_cv_header_sys_auxv_h" = "yes"])
++AS_IF([test $host_cpu = aarch64 -a "$ac_cv_header_sys_auxv_h" = "yes"], [AC_DEFINE([HAVE_RNDR],1,[Enable RNDR])],[])
+ AM_CONDITIONAL([JITTER], [false])
+ 
+ AC_ARG_ENABLE(jitterentropy,