[SYCL][NFC] Add missing __SYCL_INLINE (#1003)

One of the missed spots was introduced in #835, another one
was missed in #986

Signed-off-by: Alexey Sachkov <alexey.sachkov@intel.com>

Author: AlexeySachkov

sycl/include/CL/sycl/intel/builtins.hpp

@@ -18,7 +18,7 @@ extern int __spirv_ocl_printf(const CONSTANT_AS char *__format, ...);
 #define CONSTANT_AS
 #endif
 
-namespace cl {
+__SYCL_INLINE namespace cl {
 namespace sycl {
 namespace intel {
 namespace experimental {

sycl/source/program.cpp

@@ -11,7 +11,7 @@
 
 #include <vector>
 
-namespace cl {
+__SYCL_INLINE namespace cl {
 namespace sycl {
 
 program::program(const context &context)