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/sc/inc/conditio.hxx b/sc/inc/conditio.hxx
index 4ddb17c5573a..dce4563d0c90 100644
--- a/sc/inc/conditio.hxx
+++ b/sc/inc/conditio.hxx
@@ -37,7 +37,7 @@
 #include <tools/date.hxx>
 #include <tools/link.hxx>
 
-#include <o3tl/optional.hxx>
+#include <optional>
 #include <map>
 #include <memory>
 #include <set>
@@ -216,7 +216,7 @@ struct ScCondFormatData
     ScCondFormatData(ScCondFormatData&&);
     ~ScCondFormatData();
 
-    o3tl::optional<Color> mxColorScale;
+    std::optional<Color> mxColorScale;
     std::unique_ptr<ScDataBarInfo> pDataBar;
     std::unique_ptr<ScIconSetInfo> pIconSet;
     OUString aStyleName;