package/bitcoin: security bump to version 0.20.1

- openssl is not a dependency since version 0.20.0 and
  https://github.com/bitcoin/bitcoin/commit/8983ee3e6dd8ab658bd2caf97c326cc53ea50818
- boost chrono is not needed since version 0.20.0 and
  https://github.com/bitcoin/bitcoin/commit/bd37f2bc26158f85ef1ab73b9ca1fc0da8ea562a
- Update hash of COPYING (update in year:
  https://github.com/bitcoin/bitcoin/commit/8dc9aa90c3c7990dd5b491937ddc0e39bc929d1c)
- Update indentation in hash file (two spaces)
- Tag as a security bump as having an up to date bitcoin is important:
  https://patchwork.ozlabs.org/project/buildroot/patch/20200202085526.35742-1-james.hilliard1@gmail.com

https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-0.20.1.md
https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-0.20.0.md
https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-0.19.1.md

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/bitcoin/0001-src-randomenv.cpp-fix-build-on-uclibc.patch

@@ -0,0 +1,48 @@
+From 330cb33985d0ce97c20f4a0f0bbda0fbffe098d4 Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Mon, 9 Nov 2020 21:18:40 +0100
+Subject: [PATCH] src/randomenv.cpp: fix build on uclibc
+
+Check for HAVE_STRONG_GETAUXVAL or HAVE_WEAK_GETAUXVAL before using
+getauxval to avoid a build failure on uclibc
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status: https://github.com/bitcoin/bitcoin/pull/20358]
+---
+ src/randomenv.cpp | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/src/randomenv.cpp b/src/randomenv.cpp
+index 07122b7f6..5e07c3db4 100644
+--- a/src/randomenv.cpp
++++ b/src/randomenv.cpp
+@@ -53,7 +53,7 @@
+ #include <sys/vmmeter.h>
+ #endif
+ #endif
+-#ifdef __linux__
++#if defined(HAVE_STRONG_GETAUXVAL) || defined(HAVE_WEAK_GETAUXVAL)
+ #include <sys/auxv.h>
+ #endif
+ 
+@@ -326,7 +326,7 @@ void RandAddStaticEnv(CSHA512& hasher)
+     // Bitcoin client version
+     hasher << CLIENT_VERSION;
+ 
+-#ifdef __linux__
++#if defined(HAVE_STRONG_GETAUXVAL) || defined(HAVE_WEAK_GETAUXVAL)
+     // Information available through getauxval()
+ #  ifdef AT_HWCAP
+     hasher << getauxval(AT_HWCAP);
+@@ -346,7 +346,7 @@ void RandAddStaticEnv(CSHA512& hasher)
+     const char* exec_str = (const char*)getauxval(AT_EXECFN);
+     if (exec_str) hasher.Write((const unsigned char*)exec_str, strlen(exec_str) + 1);
+ #  endif
+-#endif // __linux__
++#endif // HAVE_STRONG_GETAUXVAL || HAVE_WEAK_GETAUXVAL
+ 
+ #ifdef HAVE_GETCPUID
+     AddAllCPUID(hasher);
+-- 
+2.28.0
+

package/bitcoin/Config.in

@@ -18,8 +18,6 @@ config BR2_PACKAGE_BITCOIN
 	select BR2_PACKAGE_BOOST_SYSTEM
 	select BR2_PACKAGE_BOOST_FILESYSTEM
 	select BR2_PACKAGE_BOOST_THREAD
-	select BR2_PACKAGE_BOOST_CHRONO
-	select BR2_PACKAGE_OPENSSL
 	select BR2_PACKAGE_LIBEVENT
 	help
 	  Bitcoin Core is an open source project which maintains and

package/bitcoin/bitcoin.hash

@@ -1,5 +1,5 @@
-# From https://bitcoincore.org/bin/bitcoin-core-0.19.0.1/SHA256SUMS.asc
-sha256 7ac9f972249a0a16ed01352ca2a199a5448fe87a4ea74923404a40b4086de284  bitcoin-0.19.0.1.tar.gz
+# From https://bitcoincore.org/bin/bitcoin-core-0.20.1/SHA256SUMS.asc
+sha256  4bbd62fd6acfa5e9864ebf37a24a04bc2dcfe3e3222f056056288d854c53b978  bitcoin-0.20.1.tar.gz
 
 # Hash for license file
-sha256 9a0f75d688e9cf5c69d3efdaa2a83af496700d252b212ec6a72f7784b47fed0c  COPYING
+sha256  96fe807030b21f88305adc32af62f9aa19915f2783509fd6f52aea02cf83f644  COPYING

package/bitcoin/bitcoin.mk

@@ -4,12 +4,12 @@
 #
 ################################################################################
 
-BITCOIN_VERSION = 0.19.0.1
+BITCOIN_VERSION = 0.20.1
 BITCOIN_SITE = https://bitcoincore.org/bin/bitcoin-core-$(BITCOIN_VERSION)
 BITCOIN_AUTORECONF = YES
 BITCOIN_LICENSE = MIT
 BITCOIN_LICENSE_FILES = COPYING
-BITCOIN_DEPENDENCIES = host-pkgconf boost openssl libevent
+BITCOIN_DEPENDENCIES = host-pkgconf boost libevent
 BITCOIN_CONF_OPTS = \
 	--disable-bench \
 	--disable-wallet \