devel/libvterm: remove patch.

This was supposed to be in the last commit. My apologies.

devel/libvterm/patches/patch-bin_vterm-ctrl_c

@@ -1,39 +0,0 @@
-Fix signed versus unsigned comparison.
-https://bugs.launchpad.net/libvterm/+bug/1668780
-
-Patch updated to apply on:
-https://github.com/neovim/libvterm/tree/nvim
-
-Index: bin/vterm-ctrl.c
---- bin/vterm-ctrl.c.orig
-+++ bin/vterm-ctrl.c
-@@ -79,9 +79,9 @@ static bool seticanon(bool icanon, bool echo)
-   return ret;
- }
- 
--static void await_c1(unsigned char c1)
-+static void await_c1(int c1)
- {
--  unsigned char c;
-+  int c;
- 
-   /* await CSI - 8bit or 2byte 7bit form */
-   bool in_esc = false;
-@@ -106,7 +106,7 @@ static char *read_csi()
-   char csi[32];
-   int i = 0;
-   for(; i < sizeof(csi)-1; i++) {
--    char c = csi[i] = getchar();
-+    int c = csi[i] = getchar();
-     if(c >= 0x40 && c <= 0x7e)
-       break;
-   }
-@@ -125,7 +125,7 @@ static char *read_dcs()
-   bool in_esc = false;
-   int i = 0;
-   for(; i < sizeof(dcs)-1; ) {
--    char c = getchar();
-+    int c = getchar();
-     if(c == 0x9c) // ST
-       break;
-     if(in_esc && c == 0x5c)