Clean up and more preparation for aarch64

(still not buildable on aarch64)
+ some clean up of odd conditions
+ python-beautifulsoup4 dropped python2 in rosa2019.1,
  but build scripts of Chromium work only with python 2,
  bundled python 2 modules must be used

chromium-browser-stable.spec

@@ -60,10 +60,13 @@
 # Do not provide libEGL.so, libGLESv2.so
 %global __provides_exclude_from ^%{_crdir}/.*\\.so$
 
+# Chromium build scripts are not compatible with Python 3 yet
+%define __python %{__python2}
+
 Summary:	A fast web browser based on the Blink engine
 Name:		chromium-browser-stable
 Version:	87.0.4280.141
-Release:	1
+Release:	2
 License:	BSD, LGPL
 Group:		Networking/WWW
 Url:		https://www.chromium.org/Home
@@ -178,6 +181,7 @@ BuildRequires:	jpeg-devel
 BuildRequires:	jsoncpp-devel
 %endif
 BuildRequires:	pam-devel
+BuildRequires:	python2
 BuildRequires:	snappy-devel
 BuildRequires:	speech-dispatcher-devel
 BuildRequires:	pkgconfig(alsa)
@@ -234,14 +238,6 @@ BuildRequires:	pkgconfig(xscrnsaver)
 BuildRequires:	pkgconfig(xt)
 BuildRequires:	pkgconfig(xtst)
 BuildRequires:	pkgconfig(zlib)
-%if %{mdvver} >= 201910
-# no support python2
-#BuildRequires:	python2dist(beautifulsoup4)
-BuildRequires:	python2dist(html5lib)
-%else
-BuildRequires:	pythonegg(beautifulsoup4)
-BuildRequires:	pythonegg(html5lib)
-%endif
 BuildRequires:	pythonegg(setuptools)
 %if %{with gost}
 BuildRequires:	chrpath
@@ -415,17 +411,11 @@ sed -i \
 # base/rand_util_posix.cc:27:10: fatal error: 'sys/random.h' file not found
 sed -i "s|sys/random.h|/usr/include/linux/random.h|g" base/rand_util_posix.cc
 
-%if %{mdvver} >= 201910
-# gn is rather convoluted and not python3 friendly -- let's make
-# sure it sees python2 when it calls python
-ln -s %{_bindir}/python2 python
-
-find . -type f -name '*.py' -exec sed -i 's,#!/usr/bin/env python,#!/usr/bin/env python2,g' {} \;
+find . -type f -name '*.py' -exec sed -i 's,#!/usr/bin/env python$,#!%{__python},g' {} \;
 
 mkdir -p local_bin
-ln -s %{__python2} local_bin/python
+ln -s %{__python} local_bin/python
 export PATH="$PWD/local_bin:$PATH"
-%endif
 
 # setup node
 mkdir -p third_party/node/linux/node-linux-x64/bin
@@ -498,8 +488,15 @@ export PYTHONPATH="../../third_party/pyjson5/src:../../xcb-proto-%{xcb_version}"
 %define enable_remoting enable_remoting=true
 %endif
 
+%ifarch aarch64
+%define target_cpu target_cpu="arm64"
+%else
+%define target_cpu %{nil}
+%endif
+
 # v NO TABS IN HERE!
 %define gn_config use_sysroot=false \
+                  %{target_cpu} \
                   system_libdir="%{_lib}" \
                   icu_use_data_file=true \
                   enable_nacl=false \
@@ -538,8 +535,12 @@ export PYTHONPATH="../../third_party/pyjson5/src:../../xcb-proto-%{xcb_version}"
 
 #clang_base_path="//third_party/llvm-build/Release+Asserts" \
 
-python2 build/linux/unbundle/replace_gn_files.py --system-libraries %{system_gn_list}
-python2 third_party/libaddressinput/chromium/tools/update-strings.py
+%{__python} build/linux/unbundle/replace_gn_files.py --system-libraries %{system_gn_list}
+%{__python} third_party/libaddressinput/chromium/tools/update-strings.py
+
+# (From Fedora)
+# We don't need to cross compile while building on an aarch64 system.
+sed -i 's|aarch64-linux-gnu-||g' build/toolchain/linux/BUILD.gn
 
 %if %{with native_clang}
 # Build clang from Google
@@ -548,7 +549,7 @@ python2 third_party/libaddressinput/chromium/tools/update-strings.py
 # 	--without-fuchsia \
 # 	--use-system-cmake \
 # 	--gcc-toolchain=%{_prefix}
-python2 tools/clang/scripts/update.py
+%{__python} tools/clang/scripts/update.py
 %endif
 
 %if %{with clang}
@@ -584,14 +585,9 @@ CFLAGS="$CFLAGS -Wno-error=pointer-to-int-cast -Wno-error=int-to-pointer-cast -f
 CXXFLAGS="$CXXFLAGS -Wno-error=attributes -Wno-error=comment -Wno-error=unused-variable -Wno-error=strict-overflow -Wno-error=deprecated-declarations -fno-strict-aliasing"
 %endif
 
-%if %{mdvver} >= 201910
-export PYTHON=%{__python2}
-python2 tools/gn/bootstrap/bootstrap.py --gn-gen-args='%{gn_config}'
-out/Release/gn gen --script-executable=/usr/bin/python2 --args='%{gn_config}' out/Release
-%else
-python tools/gn/bootstrap/bootstrap.py --gn-gen-args='%{gn_config}'
-out/Release/gn gen --args='%{gn_config}' out/Release
-%endif
+export PYTHON=%{__python}
+%{__python} tools/gn/bootstrap/bootstrap.py --gn-gen-args='%{gn_config}'
+out/Release/gn gen --script-executable=%{__python} --args='%{gn_config}' out/Release
 
 pushd out/Release
 # widevinecdmadapter