Re-enable builds for armv7hl and aarch64 architectures

The builds should hopefully work again now that we've disabled LTO and
PGO. aarch64 in particular is important because Workstation on aarch64
is considered a blocking deliverable and Firefox is a part of it.

https://bugzilla.redhat.com/show_bug.cgi?id=1881495#c9

firefox.spec

@@ -10,12 +10,6 @@ ExcludeArch: ppc64le
 %endif
 # Disabled due to https://pagure.io/fedora-infrastructure/issue/7581
 ExcludeArch: s390x
-# Temporary disabled, filed as rhbz#1872111
-ExcludeArch: aarch64
-# Temporary disabled, filed as rhbz#1878519
-%if 0%{?fedora} > 32
-ExcludeArch: armv7hl
-%endif
 
 %global enable_mozilla_crashreporter 0
 %ifarch x86_64 %{ix86}
@@ -122,7 +116,7 @@ ExcludeArch: armv7hl
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        81.0
-Release:        4%{?dist}
+Release:        5%{?dist}
 URL:            https://www.mozilla.org/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Source0:        https://archive.mozilla.org/pub/firefox/releases/%{version}%{?pre_version}/source/firefox-%{version}%{?pre_version}.source.tar.xz
@@ -980,6 +974,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
+* Tue Sep 22 2020 Kalev Lember <klember@redhat.com> - 81.0-5
+- Re-enable builds for armv7hl and aarch64 architectures
+
 * Tue Sep 22 2020 Kalev Lember <klember@redhat.com> - 81.0-4
 - Disable LTO to work around firefox build failing in F33+
 
@@ -1263,4 +1260,4 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 - Switched to in-tree nss due to rhbz#1752303
 
 * Tue Oct 15 2019 Martin Stransky <stransky@redhat.com> - 70.0-1
-- Updated to 70.0
+- Updated to 70.0