crossfiles: Add android x86 and x86_64 crossfiles

When compiling dav1d for an android app, these architectures are
required by default (along with arm and arm64 for which
crossfiles already exist).

package/crossfiles/x86-android.meson

@@ -0,0 +1,15 @@
+[binaries]
+c = 'i686-linux-android19-clang'
+cpp = 'i686-linux-android19-clang++'
+ar = 'llvm-ar'
+strip = 'llvm-strip'
+pkgconfig = 'pkg-config'
+
+[properties]
+needs_exe_wrapper = true
+
+[host_machine]
+system = 'android'
+cpu_family = 'x86'
+cpu = 'i686'
+endian = 'little'

package/crossfiles/x86_64-android.meson

@@ -0,0 +1,15 @@
+[binaries]
+c = 'x86_64-linux-android21-clang'
+cpp = 'x86_64-linux-android21-clang++'
+ar = 'llvm-ar'
+strip = 'llvm-strip'
+pkgconfig = 'pkg-config'
+
+[properties]
+needs_exe_wrapper = true
+
+[host_machine]
+system = 'android'
+cpu_family = 'x86_64'
+cpu = 'x86_64'
+endian = 'little'