Update install paths for some recipes that compile examples, add zlib to recipes that use mesa

recipes/glutin/recipe.sh

 GIT=https://gitlab.redox-os.org/redox-os/glutin.git
 GIT_UPSTREAM=https://github.com/tomaka/glutin.git
-BUILD_DEPENDS=(mesa)
+BUILD_DEPENDS=(mesa zlib)
 BRANCH=redox
 CARGOFLAGS="--example window"
 
@@ -12,7 +12,15 @@ function recipe_build {
         -L "${sysroot}/lib" \
         -l OSMesa \
         -l glapi \
+        -l z \
         -l stdc++ \
         -C link-args="-Wl,--whole-archive -lpthread -Wl,--no-whole-archive"
     skip=1
 }
+
+function recipe_stage {
+    dest="$(realpath $1)"
+    mkdir -pv "$dest/bin"
+    cp -v "target/${TARGET}/release/examples/window" "$dest/bin/glutin"
+    skip=1
+}

recipes/hematite/recipe.sh

 GIT=https://gitlab.redox-os.org/redox-os/hematite.git
 GIT_UPSTREAM=https://github.com/PistonDevelopers/hematite.git
-BUILD_DEPENDS=(mesa)
+BUILD_DEPENDS=(mesa zlib)
 BRANCH=redox
 
 function recipe_build {
@@ -11,6 +11,7 @@ function recipe_build {
         -L "${sysroot}/lib" \
         -l OSMesa \
         -l glapi \
+        -l z \
         -l stdc++ \
         -C link-args="-Wl,--whole-archive -lpthread -Wl,--no-whole-archive"
     skip=1

recipes/rust-cairo/recipe.sh

@@ -12,7 +12,13 @@ function recipe_build {
 	-l pixman-1 \
 	-l freetype \
 	-l png \
-	-l z 
+	-l z
     skip=1
 }
 
+function recipe_stage {
+    dest="$(realpath $1)"
+    mkdir -pv "$dest/bin"
+    cp -v "target/${TARGET}/release/examples/gui" "$dest/bin/rust-cairo"
+    skip=1
+}

recipes/winit/recipe.sh

@@ -2,3 +2,10 @@ GIT=https://gitlab.redox-os.org/redox-os/winit.git
 GIT_UPSTREAM=https://github.com/tomaka/winit.git
 BRANCH=redox
 CARGOFLAGS="--example window"
+
+function recipe_stage {
+    dest="$(realpath $1)"
+    mkdir -pv "$dest/bin"
+    cp -v "target/${TARGET}/release/examples/window" "$dest/bin/winit"
+    skip=1
+}