Renumber Patch101 to Patch23

This is a downstream patch, it should not have a number >= 100.

Also make the comment more verbose.

qt5-qtwebengine.spec

@@ -112,13 +112,14 @@ Patch21: qtwebengine-everywhere-src-5.10.0-gn-bootstrap-verbose.patch
 # https://codereview.qt-project.org/#/c/196922/
 # see QTBUG-60886 and QTBUG-65090
 Patch22: qtwebengine-everywhere-src-5.10.0-icu59.patch
+# workaround FTBFS with GCC 8 (#1546255, gcc#84286, #1545918, QTBUG-64759)
+# build GN with -fabi-version=11 for now
+Patch23: qtwebengine-everywhere-src-5.10.0-QTBUG-64759.patch
 # drop support for obsolete Unicode "aspirational scripts" (dropped in UTS 31),
 # fixes #error with ICU >= 60 (which was a reminder to double-check the list)
 # see: http://www.unicode.org/reports/tr31/#Aspirational_Use_Scripts
 # backport of: https://chromium-review.googlesource.com/c/chromium/src/+/731871
 Patch100: qtwebengine-everywhere-src-5.10.0-no-aspirational-scripts.patch
-# workaround FTBFS
-Patch101: qtwebengine-everywhere-src-5.10.0-QTBUG-64759.patch
 
 # handled by qt5-srpm-macros, which defines %%qt5_qtwebengine_arches
 ExclusiveArch: %{qt5_qtwebengine_arches}
@@ -366,10 +367,10 @@ BuildArch: noarch
 %patch12 -p1 -b .webrtc-neon-detect
 %patch21 -p1 -b .gn-bootstrap-verbose
 %patch22 -p1 -b .icu59
-%patch100 -p1 -b .no-aspirational-scripts
 %if 0%{?fedora} > 27
-%patch101 -p1 -b .QTBUG-64759
+%patch23 -p1 -b .QTBUG-64759
 %endif
+%patch100 -p1 -b .no-aspirational-scripts
 # fix // in #include in content/renderer/gpu to avoid debugedit failure
 sed -i -e 's!gpu//!gpu/!g' \
   src/3rdparty/chromium/content/renderer/gpu/compositor_forwarding_message_filter.cc