use STBI_ASSERT instead of assert in stbi_pvr_c.h

[mgerhardy]

diff --git a/contrib/libs/stb_image/stbi_pvr_c.h b/contrib/libs/stb_image/stbi_pvr_c.h
index 0e74f4295..7733b9619 100644
--- a/contrib/libs/stb_image/stbi_pvr_c.h
+++ b/contrib/libs/stb_image/stbi_pvr_c.h
@@ -405,7 +405,7 @@ static void UnpackModulations(const AMTC_BLOCK_STRUCT *pBlock,
        }
 
        // make sure nothing is left over
-       STBI_ASSERT(ModulationBits==0);
+       assert(ModulationBits==0);
 }
 
 /*!***********************************************************************
@@ -505,7 +505,7 @@ static void InterpolateColours(const int ColourP[4],
        // sanity check
        for(k = 0; k < 4; k++)
        {
-               STBI_ASSERT(Result[k] < 256);
+               assert(Result[k] < 256);
        }
 
 
@@ -524,7 +524,7 @@ static void InterpolateColours(const int ColourP[4],
        // 2nd sanity check
        for(k = 0; k < 4; k++)
        {
-               STBI_ASSERT(Result[k] < 256);
+               assert(Result[k] < 256);
        }
 
 }
@@ -629,11 +629,11 @@ static U32 TwiddleUV(U32 YSize, U32 XSize, U32 YPos, U32 XPos)
 
        int ShiftCount;
 
-       STBI_ASSERT(YPos < YSize);
-       STBI_ASSERT(XPos < XSize);
+       assert(YPos < YSize);
+       assert(XPos < XSize);
 
-       STBI_ASSERT(POWER_OF_2(YSize));
-       STBI_ASSERT(POWER_OF_2(XSize));
+       assert(POWER_OF_2(YSize));
+       assert(POWER_OF_2(XSize));
 
        if(YSize < XSize)
        {

[SpartanJ]

Sure, thanks.