debian/rules: build openobex-apps-doc

Below error is seen when building doc target. This error is not always reproducible.

[  355s] error: Could not create output directory /usr/src/packages/BUILD/debian/build/doc/html
[  355s] Doxygen version used: 1.9.1
[  355s] Exiting...
[  355s] make[4]: *** [doc/CMakeFiles/apidoc_html.dir/build.make:87: doc/html/index.html] Error 1
[  355s] make[4]: Leaving directory '/usr/src/packages/BUILD/debian/build'
[  355s] make[3]: *** [CMakeFiles/Makefile2:602: doc/CMakeFiles/apidoc_html.dir/all] Error 2
[  355s] -----------[ cut here ]------------
[  356s] [200%] Built target openobex-apps-doc
[  356s] make[3]: Leaving directory '/usr/src/packages/BUILD/debian/build'
[  356s] make[2]: *** [CMakeFiles/Makefile2:637: doc/CMakeFiles/doc.dir/rule] Error 2
[  356s] make[2]: Leaving directory '/usr/src/packages/BUILD/debian/build'
[  356s] make[1]: *** [Makefile:377: doc] Error 2
[  356s] make[1]: Leaving directory '/usr/src/packages/BUILD/debian/build'
[  356s] make: *** [debian/rules:76: build-indep-stamp] Error 2
[  356s] make: *** Waiting for unfinished jobs....

doc target is dependent on openobex-apps-doc target. So build openobex-apps-doc before doc to fix this issue.

Signed-off-by: Vignesh Raman vignesh.raman@collabora.com