[build] Improve winelib builds

Closes #513, which this is based on.

build-wine64.txt

@@ -7,6 +7,10 @@ strip = 'strip'
 [properties]
 winelib = true
 
+c_args=['-m64']
+cpp_args=['-m64', '--no-gnu-unique']
+cpp_link_args=['-m64', '-mwindows']
+
 [host_machine]
 system = 'linux'
 cpu_family = 'x86_64'

meson.build

@@ -26,7 +26,6 @@ else
 endif
 
 if meson.get_cross_property('winelib', false)
-  add_project_link_arguments('-mwindows', language : 'cpp')
   lib_vulkan  = declare_dependency(link_args: [ '-lvulkan-1' ])
   lib_d3d11   = declare_dependency(link_args: [ '-ld3d11' ])
   lib_dxgi    = declare_dependency(link_args: [ '-ldxgi' ])