patch 8.0.1791: using uint8_t does not work everywhere

Problem:    Using uint8_t does not work everywhere.
Solution:   Use char_u instead.
diff --git a/src/os_win32.c b/src/os_win32.c
index c474415..a90dc1f 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -7661,7 +7661,7 @@
 ctermtoxterm(
     int cterm)
 {
-    uint8_t r, g, b, idx;
+    char_u r, g, b, idx;
 
     cterm_color2rgb(cterm, &r, &g, &b, &idx);
     return (((int)r << 16) | ((int)g << 8) | (int)b);
diff --git a/src/proto/term.pro b/src/proto/term.pro
index 333df92..7eafdef 100644
--- a/src/proto/term.pro
+++ b/src/proto/term.pro
@@ -76,5 +76,5 @@
 void swap_tcap(void);
 guicolor_T gui_get_color_cmn(char_u *name);
 guicolor_T gui_get_rgb_color_cmn(int r, int g, int b);
-void cterm_color2rgb(int nr, uint8_t *r, uint8_t *g, uint8_t *b, uint8_t *ansi_idx);
+void cterm_color2rgb(int nr, char_u *r, char_u *g, char_u *b, char_u *ansi_idx);
 /* vim: set ft=c : */
diff --git a/src/term.c b/src/term.c
index 08eee67..49dee03 100644
--- a/src/term.c
+++ b/src/term.c
@@ -6981,7 +6981,7 @@
 #  define VTERM_ANSI_INDEX_NONE 0
 # endif
 
-static uint8_t ansi_table[16][4] = {
+static char_u ansi_table[16][4] = {
 //   R    G    B   idx
   {  0,   0,   0,  1}, // black
   {224,   0,   0,  2}, // dark red
@@ -7003,7 +7003,7 @@
 };
 
     void
-cterm_color2rgb(int nr, uint8_t *r, uint8_t *g, uint8_t *b, uint8_t *ansi_idx)
+cterm_color2rgb(int nr, char_u *r, char_u *g, char_u *b, char_u *ansi_idx)
 {
     int idx;
 
diff --git a/src/version.c b/src/version.c
index 467b14e..9dd2895 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1791,
+/**/
     1790,
 /**/
     1789,