Add missing cmath includes

[HuYuxin]

This fixes the compilation errors in chromium and ANGLE:

glcTextureStorageTests.cpp:76:35: error: no member named 'floor' in namespace 'std'
glcTextureStorageTests.cpp:76:46: error: no member named 'log2f' in namespace 'std'

[ao2]

When building for Android similar errors also show up for glcFramebufferBlitTests.cpp and glcTextureLodBiasTests.cpp:

.../external/openglcts/modules/common/glcFramebufferBlitTests.cpp:715:26: error: no member named 'floor' in namespace 'std'
    return (GLubyte)std::floor(f == 1.0f ? 255 : f * 255.0);
                    ~~~~~^
.../external/openglcts/modules/common/glcFramebufferBlitTests.cpp:1491:14: error: no member named 'fabs' in namespace 'std'
    if (std::fabs(actual - expected) > eps)
        ~~~~~^
2 errors generated.

@HuYuxin can you also add this change to the PR?:

diff --git a/external/openglcts/modules/common/glcFramebufferBlitTests.cpp b/external/openglcts/modules/common/glcFramebufferBlitTests.cpp
index 7accfaa..9c0b3a8 100644
--- a/external/openglcts/modules/common/glcFramebufferBlitTests.cpp
+++ b/external/openglcts/modules/common/glcFramebufferBlitTests.cpp
@@ -41,6 +41,8 @@
 #include "tcuRenderTarget.hpp"
 #include "tcuStringTemplate.hpp"
 
+#include <cmath>
+
 #define CHECK(actual, expected, info)                                                                          \
     {                                                                                                          \
         result &= ((actual) != (expected)) ? false : true;                                                     \
diff --git a/external/openglcts/modules/common/glcTextureLodBiasTests.cpp b/external/openglcts/modules/common/glcTextureLodBiasTests.cpp
index bcf4330..0875bf4 100644
--- a/external/openglcts/modules/common/glcTextureLodBiasTests.cpp
+++ b/external/openglcts/modules/common/glcTextureLodBiasTests.cpp
@@ -39,6 +39,8 @@
 #include "tcuTestLog.hpp"
 #include "tcuStringTemplate.hpp"
 
+#include <cmath>
+
 using namespace glw;
 using namespace glu;
 

Thanks, Antonio

[ao2]

Ah, I see that the changes that I needed for Android are already in the main branch: 6164879