Drop o3tl::optional wrapper

...now that macOS builds are guaranteed to have std::optional since
358146bbbd1b9775c12770fb5e497b6ec5adfc51 "Bump macOS build baseline to
Xcode 11.3 and macOS 10.14.4".

The change is done mostly mechanically with

> for i in $(git grep -Fl optional); do
>  sed -i -e 's:<o3tl/optional\.hxx>\|\"o3tl/optional\.hxx\":<optional>:' \
>   -e 's/\<o3tl::optional\>/std::optional/g' \
>   -e 's/\<o3tl::make_optional\>/std::make_optional/g' "$i"
> done
> for i in $(git grep -Flw o3tl::nullopt); do
>  sed -i -e 's/\<o3tl::nullopt\>/std::nullopt/g' "$i"
> done

(though that causes some of the resulting

  #include <optional>

to appear at different places relative to other includes than if they had been
added manually), plus a few manual modifications:

* adapt bin/find-unneeded-includes
* adapt desktop/IwyuFilter_desktop.yaml
* remove include/o3tl/optional.hxx
* quote resulting "<"/">" as "&lt;"/"&gt;" in officecfg/registry/cppheader.xsl
* and then solenv/clang-format/reformat-formatted-files

Change-Id: I68833d9f7945e57aa2bc703349cbc5a56b342273
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/89165
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/canvas/source/directx/dx_config.hxx b/canvas/source/directx/dx_config.hxx
index 86c719fed1b2..2a1cc8ee63d8 100644
--- a/canvas/source/directx/dx_config.hxx
+++ b/canvas/source/directx/dx_config.hxx
@@ -21,7 +21,7 @@
 #define INCLUDED_CANVAS_SOURCE_DIRECTX_DX_CONFIG_HXX
 
 #include <unotools/configitem.hxx>
-#include <o3tl/optional.hxx>
+#include <optional>
 #include <set>
 
 namespace basegfx { class B2IVector; }
@@ -72,7 +72,7 @@ namespace dxcanvas
         virtual void               ImplCommit() override;
         typedef std::set< DeviceInfo > ValueSet;
         ValueSet                   maValues;
-        o3tl::optional<sal_Int32> maMaxTextureSize;
+        std::optional<sal_Int32> maMaxTextureSize;
         bool                       mbBlacklistCurrentDevice;
         bool                       mbValuesDirty;
     };