Adjust includes in various places.

samples/sample_encode/src/sample_encode.cpp:1673:52: error: no member named 'ceil' in namespace 'std'
        pParams->nBitRateMultiplier = (mfxU16)std::ceil(static_cast<double>(maxVal) / mfxU16Limit);
                                              ~~~~~^
samples/sample_multi_transcode/src/transcode_utils.cpp:3012:55: error: no member named 'ceil' in namespace 'std'
        InputParams.nBitRateMultiplier = (mfxU16)std::ceil(static_cast<double>(maxVal) / mfxU16Limit);
                                                 ~~~~~^

--- samples/sample_encode/src/sample_encode.cpp.orig	2021-11-25 14:02:45 UTC
+++ samples/sample_encode/src/sample_encode.cpp
@@ -19,6 +19,7 @@ or https://software.intel.com/en-us/media-client-solut
 
 #include "mfx_samples_config.h"
 
+#include <cmath>
 #include <memory>
 #include "pipeline_encode.h"
 #include "pipeline_user.h"
--- samples/sample_multi_transcode/src/transcode_utils.cpp.orig	2021-11-25 14:02:45 UTC
+++ samples/sample_multi_transcode/src/transcode_utils.cpp
@@ -36,6 +36,7 @@ or https://software.intel.com/en-us/media-client-solut
 
 #include "version.h"
 
+#include <cmath>
 #include <vector>
 #include <fstream>
 #include <sstream>