[kwinglutils] Drop variable glTextureUnitsCount

Summary: Unused and even potentially not set.

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D3399

libkwineffects/kwinglutils.cpp

@@ -64,8 +64,6 @@ namespace KWin
 static QList<QByteArray> glExtensions;
 static QList<QByteArray> s_eglExtensions;
 
-int glTextureUnitsCount;
-
 
 // Functions
 
@@ -100,8 +98,6 @@ void cleanupGL()
     GLPlatform::cleanup();
 
     glExtensions.clear();
-
-    glTextureUnitsCount = 0;
 }
 
 bool hasGLVersion(int major, int minor, int release)

libkwineffects/kwinglutils.h

@@ -56,9 +56,6 @@ void KWINGLUTILS_EXPORT initGL(std::function<resolveFuncPtr(const char*)> resolv
 // Cleans up all resources hold by the GL Context
 void KWINGLUTILS_EXPORT cleanupGL();
 
-// Number of supported texture units
-extern KWINGLUTILS_EXPORT int glTextureUnitsCount;
-
 
 bool KWINGLUTILS_EXPORT hasGLVersion(int major, int minor, int release = 0);
 // use for both OpenGL and GLX extensions