Enable smithay/renderer_pixman feature

This enables support for using Pixman for cursor planes.

Cargo.lock

@@ -3766,6 +3766,24 @@ dependencies = [
  "futures-io",
 ]
 
+[[package]]
+name = "pixman"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d24a24da0bec14f4e43a495c1837a3c358b87532e7fe66bd75c348b89f0451b6"
+dependencies = [
+ "drm-fourcc",
+ "paste",
+ "pixman-sys",
+ "thiserror",
+]
+
+[[package]]
+name = "pixman-sys"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1a0483e89e81d7915defe83c51f23f6800594d64f6f4a21253ce87fd8444ada"
+
 [[package]]
 name = "pkg-config"
 version = "0.3.29"
@@ -4531,6 +4549,7 @@ dependencies = [
  "libloading 0.8.1",
  "libseat",
  "once_cell",
+ "pixman",
  "pkg-config",
  "profiling",
  "rand",

Cargo.toml

@@ -79,6 +79,7 @@ features = [
   "use_system_lib",
   "renderer_glow",
   "renderer_multi",
+  "renderer_pixman",
   "wayland_frontend",
   "xwayland",
 ]

debian/control

@@ -10,6 +10,7 @@ Build-Depends:
     libfontconfig-dev,
     libgbm-dev,
     libinput-dev,
+    libpixman-1-dev,
     libseat-dev,
     libsystemd-dev,
     libudev-dev,