Reapply support for X11 screenshare (#28160)

Reapplies #27807 after [revert due to not building on
ARM](https://github.com/zed-industries/zed/pull/28141) by updating scap
to include [a fix to its build on
ARM](08f0a01417)

Release Notes:

- N/A

---------

Co-authored-by: Marshall Bowers <git@maxdeviant.com>

crates/gpui/Cargo.toml

@@ -49,6 +49,7 @@ wayland = [
     "filedescriptor",
     "xkbcommon",
     "open",
+    "scap",
 ]
 x11 = [
     "blade-graphics",
@@ -65,6 +66,7 @@ x11 = [
     "x11-clipboard",
     "filedescriptor",
     "open",
+    "scap"
 ]
 
 
@@ -99,7 +101,11 @@ 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"
@@ -159,6 +165,7 @@ 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 }
@@ -193,7 +200,10 @@ 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",