Cycles OSL: windows build fixes.

intern/cycles/kernel/kernel_accumulate.h

@@ -301,10 +301,6 @@ __device_inline float3 path_radiance_sum(KernelGlobals *kg, PathRadiance *L)
 
 __device_inline void path_radiance_clamp(PathRadiance *L, float3 *L_sum, float clamp)
 {
-	#ifdef __OSL__
-	using std::isfinite;
-	#endif
-
 	float sum = fabsf((*L_sum).x) + fabsf((*L_sum).y) + fabsf((*L_sum).z);
 
 	if(!isfinite(sum)) {

intern/cycles/util/util_thread.h

@@ -75,7 +75,7 @@ protected:
  * Boost implementation is a bit slow, and Mac OS X __thread is not supported
  * but the pthreads implementation is optimized, so we use these macros. */
 
-#ifdef __APPLE__
+#if defined(__APPLE__) || defined(_WIN32)
 
 #define tls_ptr(type, name) \
 	pthread_key_t name
@@ -90,10 +90,6 @@ protected:
 
 #else
 
-#ifdef __WIN32
-#define __thread __declspec(thread)
-#endif
-
 #define tls_ptr(type, name) \
 	__thread type *name
 #define tls_set(name, value) \