Attempt at fixing build

It does build locally, but not on the OBS: will revert if not useful.
2 jobs for master in 8 minutes and 23 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
failed #69554
build_clazy_clang_tidy

00:08:22

failed #69553
linux kf5-qt5 qt5.12

00:08:12

 
Name Stage Failure
failed
build_clazy_clang_tidy Build
[ 53%] Building CXX object src/plugins/claws-mail/CMakeFiles/clawsmailimporterplugin.dir/__/sylpheed/sylpheedsettingsutils.cpp.o
[ 54%] Linking CXX shared module ../../../bin/importwizard/clawsmailimporterplugin.so
[ 54%] Built target clawsmailimporterplugin
make: *** [Makefile:160: all] Error 2
Uploading artifacts for failed job
Uploading artifacts...
WARNING: JUnitTestResults.xml: no matching files
ERROR: No files to upload
ERROR: Job failed: exit code 1
failed
linux kf5-qt5 qt5.12 Build
[ 81%] Built target seamonkeyimporterplugin
[ 82%] Linking CXX shared module ../../../bin/importwizard/icedoveimporterplugin.so
[ 82%] Built target icedoveimporterplugin
make: *** [Makefile:160: all] Error 2
Uploading artifacts for failed job
Uploading artifacts...
WARNING: JUnitTestResults.xml: no matching files
ERROR: No files to upload
ERROR: Job failed: exit code 1