Fix a few MSVC warnings (#6782)

Source/levels/drlg_l4.cpp

@@ -304,7 +304,7 @@ void MakeDmt()
 {
 	for (int y = 0; y < DMAXY - 1; y++) {
 		for (int x = 0; x < DMAXX - 1; x++) {
-			int val = (DungeonMask.test(x + 1, y + 1) << 3) | (DungeonMask.test(x, y + 1) << 2) | (DungeonMask.test(x + 1, y) << 1) | DungeonMask.test(x, y);
+			int val = (DungeonMask.test(x + 1, y + 1) << 3) | (DungeonMask.test(x, y + 1) << 2) | (DungeonMask.test(x + 1, y) << 1) | (DungeonMask.test(x, y) << 0);
 			dungeon[x][y] = L4ConvTbl[val];
 		}
 	}

Source/portal.cpp

@@ -101,7 +101,7 @@ void DeactivatePortal(int i)
 
 bool PortalOnLevel(size_t i)
 {
-	if (Portals[i].setlvl == setlevel && Portals[i].level == setlevel ? static_cast<int>(setlvlnum) : currlevel)
+	if (Portals[i].setlvl == setlevel && Portals[i].level == (setlevel ? static_cast<int>(setlvlnum) : currlevel))
 		return true;
 
 	return leveltype == DTYPE_TOWN;

Source/utils/soundsample.cpp

@@ -32,7 +32,7 @@ constexpr float LogBase = 10.0;
  * Picked so that a volume change of -10 dB results in half perceived loudness.
  * VolumeScale = -1000 / log(0.5)
  */
-constexpr float VolumeScale = 3321.9281;
+constexpr float VolumeScale = 3321.9281F;
 
 /**
  * Min and max volume range, in millibel.

test/missiles_test.cpp

@@ -11,7 +11,7 @@ using ::testing::Lt;
 using ::testing::Pair;
 using ::testing::UnorderedElementsAre;
 
-void TestArrowRotatesUniformly(Missile &missile, int startingFrame, int leftFrame, int rightFrame)
+void TestArrowRotatesUniformly(Missile &missile, int startingFrame, unsigned leftFrame, unsigned rightFrame)
 {
 	std::unordered_map<int, unsigned> observed {};
 	for (auto i = 0; i < 100; i++) {
@@ -20,7 +20,7 @@ void TestArrowRotatesUniformly(Missile &missile, int startingFrame, int leftFram
 		observed[missile._miAnimFrame]++;
 	}
 
-	EXPECT_THAT(observed, UnorderedElementsAre(Pair(leftFrame, AllOf(Gt(30), Lt(70))), Pair(rightFrame, AllOf(Gt(30), Lt(70))))) << "Arrows should rotate either direction roughly 50% of the time";
+	EXPECT_THAT(observed, UnorderedElementsAre(Pair(leftFrame, AllOf(Gt(30U), Lt(70U))), Pair(rightFrame, AllOf(Gt(30U), Lt(70U))))) << "Arrows should rotate either direction roughly 50% of the time";
 }
 
 void TestAnimatedMissileRotatesUniformly(Missile &missile, int startingDir, int leftDir, int rightDir)
@@ -32,7 +32,7 @@ void TestAnimatedMissileRotatesUniformly(Missile &missile, int startingDir, int
 		observed[missile._mimfnum]++;
 	}
 
-	EXPECT_THAT(observed, UnorderedElementsAre(Pair(leftDir, AllOf(Gt(30), Lt(70))), Pair(rightDir, AllOf(Gt(30), Lt(70))))) << "Animated missiles should rotate either direction roughly 50% of the time";
+	EXPECT_THAT(observed, UnorderedElementsAre(Pair(leftDir, AllOf(Gt(30U), Lt(70U))), Pair(rightDir, AllOf(Gt(30U), Lt(70U))))) << "Animated missiles should rotate either direction roughly 50% of the time";
 }
 
 TEST(Missiles, RotateBlockedMissileArrow)