gldual: Fix build with gcc 4.8+
Use -Wno-error=unused-parameter with gcc >= 4.8
gl2_jni: Fix build with gcc 4.8+
Use -Wno-error=unused-parameter with gcc >= 4.8
gl_perfapp: Fix build with gcc 4.8+
Use -Wno-error=unused-parameter with gcc >= 4.8
gl_jni: Fix build with gcc 4.8+
Use -Wno-error=unused-parameter with gcc >= 4.8