Revert "Use scap library to implement screensharing on X11 (#27807)" (#28141)

This reverts commit c2afc2271b.

Build on ARM if failing, likely because `c_char` is `u8` on arm and `i8`
on x86:

```
error[E0308]: mismatched types
   --> /home/runner/.cargo/git/checkouts/scap-40ad33e1dd47aaea/5715067/src/targets/linux/mod.rs:75:74
    |
75  |     let result = unsafe { XmbTextPropertyToTextList(display, &mut xname, &mut list, &mut count) };
    |                           -------------------------                      ^^^^^^^^^ expected `*mut *mut *mut u8`, found `&mut *mut *mut i8`
    |                           |
    |                           arguments to this function are incorrect
    |
    = note:    expected raw pointer `*mut *mut *mut u8`
            found mutable reference `&mut *mut *mut i8`
note: function defined here
   --> /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/x11-2.21.0/src/xlib.rs:552:10
    |
552 |   pub fn XmbTextPropertyToTextList (_4: *mut Display, _3: *const XTextProperty, _2: *mut *mut *mut c_char, _1: *mut c_int) -> c_int,
    |          ^^^^^^^^^^^^^^^^^^^^^^^^^
```

Release Notes:

- N/A

crates/gpui/Cargo.toml

@@ -49,7 +49,6 @@ wayland = [
     "filedescriptor",
     "xkbcommon",
     "open",
-    "scap",
 ]
 x11 = [
     "blade-graphics",
@@ -66,7 +65,6 @@ x11 = [
     "x11-clipboard",
     "filedescriptor",
     "open",
-    "scap"
 ]
 
 
@@ -101,11 +99,7 @@ profiling.workspace = true
 rand = { optional = true, workspace = true }
 raw-window-handle = "0.6"
 refineable.workspace = true
-resvg = { version = "0.45.0", default-features = false, features = [
-    "text",
-    "system-fonts",
-    "memmap-fonts",
-] }
+resvg = { version = "0.45.0", default-features = false, features = ["text", "system-fonts", "memmap-fonts"] }
 usvg = { version = "0.45.0", default-features = false }
 schemars.workspace = true
 seahash = "4.1"
@@ -165,7 +159,6 @@ cosmic-text = { version = "0.13.2", optional = true }
 font-kit = { git = "https://github.com/zed-industries/font-kit", rev = "5474cfad4b719a72ec8ed2cb7327b2b01fd10568", features = [
     "source-fontconfig-dlopen",
 ], optional = true }
-scap = { workspace = true, optional = true }
 
 calloop = { version = "0.13.0" }
 filedescriptor = { version = "0.8.2", optional = true }
@@ -200,10 +193,7 @@ x11rb = { version = "0.13.1", features = [
     "resource_manager",
     "sync",
 ], optional = true }
-xkbcommon = { version = "0.8.0", features = [
-    "wayland",
-    "x11",
-], optional = true }
+xkbcommon = { version = "0.8.0", features = ["wayland", "x11"], optional = true }
 xim = { git = "https://github.com/XDeme1/xim-rs", rev = "d50d461764c2213655cd9cf65a0ea94c70d3c4fd", features = [
     "x11rb-xcb",
     "x11rb-client",