Run meson test when possible.

To run unit-test (meson) on cross-compilation, we need a wrapper to run
the binary (wine, qemu, ...), but:

- We have no emulator for android (we have one for the system, but we can't
  simply run a binary)
- With dynamic compilation, it seems pretty complex to configure them
  correctly.
- For mingw32 compilation, `wine` need to be correctly configured to
  find dll from the system mingw32 installation.

templates/meson_android_cross_file.txt

@@ -0,0 +1,19 @@
+[binaries]
+pkgconfig = 'pkg-config'
+c = '{toolchain.binaries[CC]}'
+ar = '{toolchain.binaries[AR]}'
+cpp = '{toolchain.binaries[CXX]}'
+strip = '{toolchain.binaries[STRIP]}'
+
+[properties]
+c_link_args = {extra_libs!r}
+cpp_link_args = {extra_libs!r}
+c_args = {extra_cflags!r}
+cpp_args = {extra_cflags!r}
+android_abi = '{host_machine[abi]}'
+
+[host_machine]
+cpu_family = '{host_machine[cpu_family]}'
+cpu = '{host_machine[cpu]}'
+system = '{host_machine[lsystem]}'
+endian = '{host_machine[endian]}'

templates/meson_cross_file.txt

@@ -4,6 +4,7 @@ c = '{toolchain.binaries[CC]}'
 ar = '{toolchain.binaries[AR]}'
 cpp = '{toolchain.binaries[CXX]}'
 strip = '{toolchain.binaries[STRIP]}'
+{toolchain.exec_wrapper_def}
 
 [properties]
 c_link_args = {extra_libs!r}