Include what these files use

UnitTest.h's EXPECT_ macros all call printf and EXPECT_EQ_MEM calls memcmp, but
it included neither <cstdio> nor <cstring> - it has been relying on whatever the
including file happened to pull in first, and TestMpegCsc was the first not to.
The same shape in sceMpegbase.cpp and sceVideocodec.cpp, which use std::min,
std::move and memcpy without saying where they come from.

Also drop an abs() from TestMpegCsc rather than include <cstdlib> for one
subtraction.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

Core/HLE/sceMpegbase.cpp

@@ -20,7 +20,10 @@
 // mpeg.prx drives these directly, so they have to be real for the firmware module to run in place
 // of our sceMpeg HLE.
 
+#include <algorithm>
+#include <cstring>
 #include <map>
+#include <utility>
 #include <vector>
 
 #include "Common/Serialize/Serializer.h"

Core/HLE/sceVideocodec.cpp

@@ -26,7 +26,9 @@
 // by looking at sceMpegBaseYCrCbCopy output on a real PSP.
 
 #include <algorithm>
+#include <cstring>
 #include <map>
+#include <utility>
 #include <vector>
 
 #include "Common/Serialize/Serializer.h"

unittest/TestMpegCsc.cpp

@@ -23,8 +23,9 @@
 // MpegCscRange has something to be wrong against that isn't itself. The speed half reports
 // megapixels per second for a 480x272 frame, the size a PSP movie actually is.
 
-#include <cmath>
+#include <cstdio>
 #include <cstring>
+#include <utility>
 #include <vector>
 
 #include "Common/CommonTypes.h"
@@ -351,8 +352,9 @@ bool TestMpegCsc() {
 				memcpy(&a, &sws[off], bpp);
 				memcpy(&b, &ref[off], bpp);
 				for (int ch = 0; ch < 3; ch++) {
-					const int d = abs((int)((a >> shifts[ch]) & masks[ch]) -
-						(int)((b >> shifts[ch]) & masks[ch]));
+					const int va = (int)((a >> shifts[ch]) & masks[ch]);
+					const int vb = (int)((b >> shifts[ch]) & masks[ch]);
+					const int d = va > vb ? va - vb : vb - va;
 					worst = worst > d ? worst : d;
 					total += d;
 					count++;

unittest/UnitTest.h

@@ -1,6 +1,8 @@
 #pragma once
 
 #include <cmath>
+#include <cstdio>
+#include <cstring>
 #include <algorithm>
 
 inline bool rel_equal(float a, float b, float precision) {