Enable libpiex for Windows

This is needed to use skia in Android Studio for Windows.

Test: sdk build
Change-Id: Iaf219ff802dd367a5b9679306319049590885fad

Android.bp

@@ -12,6 +12,11 @@ cc_library_static {
         "src/binary_parse/cached_paged_byte_array.cc",
         "src/binary_parse/range_checked_byte_ptr.cc",
     ],
+    target: {
+        windows: {
+            enabled: true,
+        },
+    },
 }
 
 cc_library_static {
@@ -23,6 +28,11 @@ cc_library_static {
         "src/image_type_recognition/image_type_recognition_lite.cc",
     ],
     static_libs: ["libbinary_parse"],
+    target: {
+        windows: {
+            enabled: true,
+        },
+    },
 }
 
 cc_library_static {
@@ -34,6 +44,11 @@ cc_library_static {
         "src/tiff_directory/tiff_directory.cc",
     ],
     static_libs: ["libbinary_parse"],
+    target: {
+        windows: {
+            enabled: true,
+        },
+    },
 }
 
 cc_library_shared {
@@ -54,4 +69,9 @@ cc_library_shared {
         "libimage_type_recognition",
         "libtiff_directory",
     ],
+    target: {
+        windows: {
+            enabled: true,
+        },
+    },
 }