package/boost: bump to version 1.74.0 to fix C++20

GCC 10 with -std=c++20 breaks boost library due to allocator changes.
https://github.com/boostorg/bimap/issues/23

We need boost 1.74.0 to fix build with gcc-10 -std=c++20. Note that none
of the Buildroot packages that use boost set -std=c++20, so no in-tree
failures.

Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
Reviewed-by: Michael Nosthoff <buildroot@heine.tech>
Tested-by: Michael Nosthoff <buildroot@heine.tech>  for arm
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/boost/0002-fenv.patch

@@ -18,7 +18,7 @@ Index: b/boost/config/platform/linux.hpp
 ===================================================================
 --- a/boost/config/platform/linux.hpp
 +++ b/boost/config/platform/linux.hpp
-@@ -47,6 +47,16 @@
+@@ -48,6 +48,16 @@
  #endif
  
  //

package/boost/boost.hash

@@ -1,5 +1,5 @@
-# From https://www.boost.org/users/history/version_1_73_0.html
-sha256  4eb3b8d442b426dc35346235c8733b5ae35ba431690e38c6a8263dce9fcbb402  boost_1_73_0.tar.bz2
+# From https://www.boost.org/users/history/version_1_74_0.html
+sha256  83bfc1507731a0906e387fc28b7ef5417d591429e51e788417fe9ff025e116b1  boost_1_74_0.tar.bz2
 
 # Locally computed
 sha256  c9bff75738922193e67fa726fa225535870d2aa1059f91452c411736284ad566  LICENSE_1_0.txt

package/boost/boost.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-BOOST_VERSION = 1.73.0
+BOOST_VERSION = 1.74.0
 BOOST_SOURCE = boost_$(subst .,_,$(BOOST_VERSION)).tar.bz2
 BOOST_SITE = https://dl.bintray.com/boostorg/release/$(BOOST_VERSION)/source
 BOOST_INSTALL_STAGING = YES