Cleanup: GPUShaderShared: Complete vector support

Move some declaration from `GPU_shader_shared.h` to the main
common file and add missing vector declarations.

source/blender/gpu/GPU_shader_shared.h

@@ -25,13 +25,6 @@
 #  include "intern/gpu_shader_shared_utils.h"
 #endif
 
-#ifdef __cplusplus
-using blender::float2;
-using blender::float3;
-using blender::float4;
-using blender::float4x4;
-#endif
-
 struct NodeLinkData {
   float4 colors[3];
   /* bezierPts Is actually a float2, but due to std140 each element needs to be aligned to 16

source/blender/gpu/intern/gpu_shader_shared_utils.h

@@ -73,31 +73,44 @@
 #  define bool3 bvec3
 #  define bool4 bvec4
 
-#else /* C */
+#else /* C / C++ */
 #  pragma once
 
 #  include "BLI_assert.h"
 
 #  ifdef __cplusplus
 #    include "BLI_float4x4.hh"
-#  else
+#    include "BLI_math_vec_types.hh"
+using blender::float2;
+using blender::float3;
+using blender::float4;
+using blender::float4x4;
+using blender::int2;
+using blender::int3;
+using blender::int4;
+using blender::uint2;
+using blender::uint3;
+using blender::uint4;
+using bool1 = int;
+using bool2 = blender::int2;
+using bool3 = blender::int3;
+using bool4 = blender::int4;
+
+#  else /* C */
 typedef float float2[2];
 typedef float float3[3];
 typedef float float4[4];
 typedef float float4x4[4][4];
-#  endif
 typedef int int2[2];
 typedef int int3[2];
 typedef int int4[4];
 typedef uint uint2[2];
 typedef uint uint3[3];
 typedef uint uint4[4];
-typedef int int2[2];
-typedef int int3[2];
-typedef int int4[4];
 typedef int bool1;
 typedef int bool2[2];
 typedef int bool3[2];
 typedef int bool4[4];
+#  endif
 
 #endif