Fix the braces for "extern C" section

[MRK2009]

If it didn't fixed, it gives out this error:

/opt/hostedtoolcache/haxe/4.2.5/x64/lib/hxcpp/4,3,171/src/hx/AndroidCompat.cpp:77:1: error: expected '}'
   77 | 
      | ^
/opt/hostedtoolcache/haxe/4.2.5/x64/lib/hxcpp/4,3,171/src/hx/AndroidCompat.cpp:11:12: note: to match this '{'
   11 | extern "C" {
      |            ^
1 error generated.

The #endif part is in the wrong line, since ceb70d0.

[tobil4sk]

Confirmed that this fixes 32 bit android builds (e.g. -D HXCPP_X86)