If user doesn't compile with glew 1.6, cut out program binaries so everything still compiles.

Source/Plugins/Plugin_VideoOGL/Src/ProgramShaderCache.cpp

@@ -137,9 +137,10 @@ namespace OGL
 			glAttachShader(entry.program.glprogid, entry.program.vsid);
 			
 		glAttachShader(entry.program.glprogid, entry.program.psid);
-
+		#ifdef GLEW_VERSION_4_0
 		if (g_ActiveConfig.backend_info.bSupportsGLSLCache)
 			glProgramParameteri(entry.program.glprogid, GL_PROGRAM_BINARY_RETRIEVABLE_HINT, GL_TRUE);
+		#endif
 		
 		glLinkProgram(entry.program.glprogid);
 		
@@ -201,7 +202,7 @@ namespace OGL
 			glBindBufferRange(GL_UNIFORM_BUFFER, 1, s_ps_vs_ubo, 0, ps_data_size);
 			glBindBufferRange(GL_UNIFORM_BUFFER, 2, s_ps_vs_ubo, s_vs_data_offset, vs_data_size);
 		}
-		
+		#ifdef GLEW_VERSION_4_0
 		// Read our shader cache, only if supported
 		if (g_ActiveConfig.backend_info.bSupportsGLSLCache)
 		{
@@ -218,6 +219,7 @@ namespace OGL
 			glGetIntegerv(GL_PROGRAM_BINARY_FORMATS, Formats);
 			ProgramFormat = (GLenum)Formats[0]; // We don't really care about format
 		}
+		#endif
 	}
 	
 	void ProgramShaderCache::Shutdown(void)

Source/Plugins/Plugin_VideoOGL/Src/ProgramShaderCache.h

@@ -79,16 +79,24 @@ struct PROGRAMSHADER
 	GLint binaryLength;
 	u8 *Data()
 	{
+		#ifdef GLEW_VERSION_4_0
 		glGetProgramiv(glprogid, GL_PROGRAM_BINARY_LENGTH, &binaryLength);
         u8* binary = (u8*)malloc(binaryLength);
         glGetProgramBinary(glprogid, binaryLength, NULL, &ProgramFormat, binary);
         return binary;
+        #else
+        return NULL;
+        #endif
 	}
 	GLint Size()
 	{
+		#ifdef GLEW_VERSION_4_0
 		if(!binaryLength)
 			glGetProgramiv(glprogid, GL_PROGRAM_BINARY_LENGTH, &binaryLength);
 		return binaryLength;
+		#else
+		return 0;
+		#endif
 	}
 };
 
@@ -119,6 +127,7 @@ class ProgramShaderCache
 		public:
 			void Read(const PROGRAMUID &key, const u8 *value, u32 value_size)
 			{
+				#ifdef GLEW_VERSION_4_0
 				PCacheEntry entry;
 
 				// The two shaders might not even exist anymore
@@ -139,6 +148,7 @@ class ProgramShaderCache
 					glUseProgram(entry.program.glprogid);
 					SetProgramVariables(entry, key);
 				}
+				#endif
 			}
 	};