Fix Helpfile 'online-help.qhc' was not found

- Add patch: cppcheck-2.2-online-help.patch
- Allow building under F31 and F32 by adding
  %%undefine __cmake_in_source_build

cppcheck-2.2-online-help.patch

@@ -0,0 +1,25 @@
+From df9f6f38be7ed385b0b56d5c6101e34f717e2318 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Wolfgang=20St=C3=B6ggl?= <c72578@yahoo.de>
+Date: Sun, 11 Oct 2020 03:49:27 +0200
+Subject: [PATCH] Look for Qt online-help file also in FILESDIR (#2844)
+
+---
+ gui/helpdialog.cpp | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/gui/helpdialog.cpp b/gui/helpdialog.cpp
+index 706266968b..c158c8092f 100644
+--- a/gui/helpdialog.cpp
++++ b/gui/helpdialog.cpp
+@@ -33,6 +33,11 @@ static QString getHelpFile()
+           << datadir
+           << (QApplication::applicationDirPath() + "/help")
+           << QApplication::applicationDirPath();
++#ifdef FILESDIR
++    const QString filesdir = FILESDIR;
++    paths << (filesdir + "/help")
++          << filesdir;
++#endif
+     for (QString p: paths) {
+         QString filename = p + "/online-help.qhc";
+         if (QFileInfo(filename).exists())

cppcheck.spec

@@ -1,6 +1,8 @@
+%undefine __cmake_in_source_build
+
 Name:           cppcheck
 Version:        2.2
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Tool for static C/C++ code analysis
 License:        GPLv3+
 URL:            http://cppcheck.wiki.sourceforge.net/
@@ -14,6 +16,9 @@ Patch1:         cppcheck-2.2-translations.patch
 Patch2:         cppcheck-1.88-htmlreport-python3.patch
 # https://github.com/danmar/cppcheck/commit/b052843
 Patch3:         cppcheck-2.2-exprengine.patch
+# Look for Qt online-help file also in FILESDIR
+# https://github.com/danmar/cppcheck/commit/df9f6f3
+Patch4:         cppcheck-2.2-online-help.patch
 
 BuildRequires:  gcc-c++
 BuildRequires:  pcre-devel
@@ -60,8 +65,12 @@ from xml files first generated using cppcheck.
 %patch1 -p1 -b .translations
 %patch2 -p1 -b .python3
 %patch3 -p1 -b .exprengine
+%patch4 -p1 -b .online-help
 # Make sure bundled tinyxml is not used
 rm -r externals/tinyxml
+# Generate the Qt online-help file
+cd gui/help
+qhelpgenerator-qt5 online-help.qhcp -o online-help.qhc
 
 %build
 # Manuals
@@ -82,6 +91,9 @@ install -D -p -m 644 cppcheck.1 %{buildroot}%{_mandir}/man1/cppcheck.1
 desktop-file-validate %{buildroot}%{_datadir}/applications/cppcheck-gui.desktop
 # Install logo
 install -D -p -m 644 gui/cppcheck-gui.png %{buildroot}%{_datadir}/pixmaps/cppcheck-gui.png
+# Install the Qt online-help file
+install -D -p -m 644 gui/help/online-help.qhc %{buildroot}%{_datadir}/Cppcheck/help/online-help.qhc
+install -D -p -m 644 gui/help/online-help.qch %{buildroot}%{_datadir}/Cppcheck/help/online-help.qch
 
 # Install htmlreport
 install -D -p -m 755 htmlreport/cppcheck-htmlreport %{buildroot}%{_bindir}/cppcheck-htmlreport
@@ -108,6 +120,9 @@ cd %{_vpath_builddir}/bin
 %{_bindir}/cppcheck-htmlreport
 
 %changelog
+* Sun Oct 11 2020 Wolfgang Stöggl <c72578@yahoo.de> - 2.2-2
+- Fix Helpfile 'online-help.qhc' was not found
+
 * Sun Oct 04 2020 Wolfgang Stöggl <c72578@yahoo.de> - 2.2-1
 - Update to 2.2.