[vte] lib: Replace deprecated std::is_pod

[Christian Persch <chpe src gnome org>]

commit 91d7e0f0b90f9ae3e94a1db6cda6e81ea2ae6431
Author: Christian Persch <chpe src gnome org>
Date:   Thu Feb 4 19:48:48 2021 +0100

    lib: Replace deprecated std::is_pod
    
    ... in preparation of requiring C++20.

 src/ring.hh     | 4 ++--
 src/vtetypes.cc | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/ring.hh b/src/ring.hh
index f115eaaf..9b38a480 100644
--- a/src/ring.hh
+++ b/src/ring.hh
@@ -130,7 +130,7 @@ private:
                 guint8 bidi_flags: 4;
         } RowRecord;
 
-        static_assert(std::is_pod<RowRecord>::value, "Ring::RowRecord is not POD");
+        static_assert(std::is_standard_layout_v<RowRecord> && std::is_trivial_v<RowRecord>, "Ring::RowRecord 
is not POD");
 
         /* Represents a cell position, see ../doc/rewrap.txt */
         typedef struct _CellTextOffset {
@@ -139,7 +139,7 @@ private:
                 int eol_cells;       /* -1 if over a character, >=0 if at EOL or beyond */
         } CellTextOffset;
 
-        static_assert(std::is_pod<CellTextOffset>::value, "Ring::CellTextOffset is not POD");
+        static_assert(std::is_standard_layout_v<CellTextOffset> && std::is_trivial_v<CellTextOffset>, 
"Ring::CellTextOffset is not POD");
 
         inline bool read_row_record(RowRecord* record /* out */,
                                     row_t position)
diff --git a/src/vtetypes.cc b/src/vtetypes.cc
index b2a2e085..f25cc0b6 100644
--- a/src/vtetypes.cc
+++ b/src/vtetypes.cc
@@ -28,10 +28,10 @@ static_assert(sizeof(vte::grid::coords) == 2 * sizeof(long), "vte::grid::coords
 
 static_assert(sizeof(vte::grid::span) == 4 * sizeof(long), "vte::grid::span size wrong");
 
-static_assert(std::is_pod<vte::view::coords>::value, "vte::view::coords not POD");
+static_assert(std::is_standard_layout_v<vte::view::coords> && std::is_trivial_v<vte::view::coords>, 
"vte::view::coords not POD");
 static_assert(sizeof(vte::view::coords) == 2 * sizeof(vte::view::coord_t), "vte::view::coords size wrong");
 
-static_assert(std::is_pod<vte::color::rgb>::value, "vte::color::rgb not POD");
+static_assert(std::is_standard_layout_v<vte::color::rgb> && std::is_trivial_v<vte::color::rgb>, 
"vte::color::rgb not POD");
 static_assert(sizeof(vte::color::rgb) == sizeof(PangoColor), "vte::color::rgb size wrong");
 
 static_assert(sizeof(vte::libc::FD) == sizeof(int), "vte::libc::FD size wrong");