Build cleanups

* Always use NEON if building for __aarch64__. NEON is required on arm64.

* Apply Windows build options to librive_skia_renderer when the *target* is Windows (not the host). This fixes Windows building for Android.

Diffs=
331ad0d55 Build cleanups

.rive_head

diff --git a/.rive_head b/.rive_head
index ea4aba6..f7b09e1 100644
--- a/.rive_head
+++ b/.rive_head
@@ -1 +1 @@
-2538229d6cc08105066da8d1cd306a2a57d35483
+331ad0d55068e5059f3e9c85af5382836e278e4e

include/rive/math/simd.hpp

diff --git a/include/rive/math/simd.hpp b/include/rive/math/simd.hpp
index c50b473..2ee5a4e 100644
--- a/include/rive/math/simd.hpp
+++ b/include/rive/math/simd.hpp
@@ -26,7 +26,7 @@
 #include <immintrin.h>
 #endif
 
-#ifdef __ARM_NEON__
+#if defined(__ARM_NEON__) || defined(__aarch64__)
 #include <arm_neon.h>
 #endif
 
@@ -254,7 +254,6 @@
 }
 #endif
 
-#ifdef __ARM_NEON__
 #ifdef __aarch64__
 template <> RIVE_ALWAYS_INLINE gvec<float, 4> sqrt(gvec<float, 4> x)
 {
@@ -274,7 +273,6 @@
     return x;
 }
 #endif
-#endif
 
 // This will only be present when building with Emscripten and "-msimd128".
 #if __has_builtin(__builtin_wasm_sqrt_f32x4)
@@ -342,7 +340,7 @@
 
 ////// Column-major (transposed) loads //////
 
-#ifdef __ARM_NEON__
+#if defined(__ARM_NEON__) || defined(__aarch64__)
 RIVE_ALWAYS_INLINE std::tuple<gvec<float, 4>, gvec<float, 4>, gvec<float, 4>, gvec<float, 4>>
 load4x4f(const float* matrix)
 {

skia/renderer/build/premake5.lua

diff --git a/skia/renderer/build/premake5.lua b/skia/renderer/build/premake5.lua
index d91964f..709ea37 100644
--- a/skia/renderer/build/premake5.lua
+++ b/skia/renderer/build/premake5.lua
@@ -26,21 +26,6 @@
         '../../../include'
     }
 
-    if os.host() == 'macosx' then
-        links {'Cocoa.framework', 'rive', 'skia'}
-    elseif os.host() == 'windows' then
-        architecture 'x64'
-        links {
-            'rive',
-            'skia',
-        }
-        defines {'_USE_MATH_DEFINES'}
-        staticruntime 'on' -- Match Skia's /MT flag for link compatibility
-        runtime 'Release' -- Use /MT even in debug (/MTd is incompatible with Skia)
-    else
-        links {'rive', 'skia'}
-    end
-
     libdirs {'../../../build/%{cfg.system}/bin/%{cfg.buildcfg}'}
 
     files {
@@ -49,16 +34,26 @@
 
     buildoptions {'-Wall', '-fno-exceptions', '-fno-rtti', '-Werror=format'}
 
+    filter "system:windows"
+    do
+        architecture 'x64'
+        defines {'_USE_MATH_DEFINES'}
+        staticruntime 'on' -- Match Skia's /MT flag for link compatibility
+        runtime 'Release' -- Use /MT even in debug (/MTd is incompatible with Skia)
+    end
+
     filter {'system:macosx'}
     do
         includedirs {SKIA_DIR}
         libdirs {SKIA_DIR .. '/out/static'}
+        links {'Cocoa.framework', 'rive', 'skia'}
     end
 
     filter {'system:linux or windows'}
     do
         includedirs {SKIA_DIR}
         libdirs {SKIA_DIR .. '/out/static'}
+        links {'rive', 'skia'}
     end
 
     filter {'system:ios'}