[chore] Drop SDL 1.2 (#5324)

Depends on https://github.com/koreader/koreader-base/pull/963.

Also includes Initial import of <linux/rtc.h> related stuff https://github.com/koreader/koreader-base/pull/965

base

@@ -1 +1 @@
-Subproject commit 639de5fa009b5688f2e86920b68b1a863c9f3c7a
+Subproject commit 0ef40965bb83f37b2d94c9e7b85c23a97c3a1504

frontend/device/sdl/device.lua

@@ -1,6 +1,5 @@
 local Event = require("ui/event")
 local Generic = require("device/generic/device")
-local util = require("ffi/util")
 local logger = require("logger")
 
 local function yes() return true end
@@ -107,7 +106,6 @@ function Device:init()
         self.isAlwaysPortrait = yes
     end
 
-    if util.haveSDL2() then
     self.hasClipboard = yes
     self.screen = require("ffi/framebuffer_SDL2_0"):new{device = self, debug = logger.dbg}
 
@@ -219,13 +217,6 @@ function Device:init()
         end,
         file_chooser = input.file_chooser,
     }
-    else
-        self.screen = require("ffi/framebuffer_SDL1_2"):new{device = self, debug = logger.dbg}
-        self.input = require("device/input"):new{
-            device = self,
-            event_map = require("device/sdl/event_map_sdl"),
-        }
-    end
 
     self.keyboard_layout = require("device/sdl/keyboard_layout")
 

frontend/device/sdl/event_map_sdl.lua

@@ -1,31 +0,0 @@
-return {
-    [10] = "1", [11] = "2", [12] = "3", [13] = "4", [14] = "5", [15] = "6", [16] = "7", [17] = "8", [18] = "9", [19] = "0",
-    [24] = "Q", [25] = "W", [26] = "E", [27] = "R", [28] = "T", [29] = "Y", [30] = "U", [31] = "I", [32] = "O", [33] = "P",
-    [38] = "A", [39] = "S", [40] = "D", [41] = "F", [42] = "G", [43] = "H", [44] = "J", [45] = "K", [46] = "L",
-    [52] = "Z", [53] = "X", [54] = "C", [55] = "V", [56] = "B", [57] = "N", [58] = "M",
-
-    [22] = "Backspace", -- Backspace
-    [36] = "Press", -- Enter
-    [50] = "Shift", -- left shift
-    [60] = ".",
-    [61] = "/",
-    [62] = "Sym", -- right shift key
-    [64] = "Alt", -- left alt
-    [65] = " ", -- Spacebar
-    [67] = "Menu", -- F[1]
-    [68] = "Power", -- F[2]
-    [72] = "LPgBack", -- F[6]
-    [73] = "LPgFwd", -- F[7]
-    [95] = "VPlus", -- F[11]
-    [96] = "VMinus", -- F[12]
-    [105] = "AA", -- right alt key
-    [110] = "Home", -- Home
-    [111] = "Up", -- arrow up
-    [112] = "RPgBack", -- normal PageUp
-    [113] = "Left", -- arrow left
-    [114] = "Right", -- arrow right
-    [115] = "End", -- End (above arrows)
-    [116] = "Down", -- arrow down
-    [117] = "RPgFwd", -- normal PageDown
-    [119] = "Del", -- Delete
-}