frameworks/native/opengl: Fix build with gcc 4.8

In gcc 4.8, the warning for unused parameters (such as JNIEnv* pointers
in JNI functions that don't need it) is enabled by default - causing
-Werror to break the build.

Change-Id: Ib91721f2cb9912b79c2ac19b4210b1309b08304f
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>

opengl/tests/gl2_jni/Android.mk

@@ -30,7 +30,7 @@ include $(CLEAR_VARS)
 # Optional tag would mean it doesn't get installed by default
 LOCAL_MODULE_TAGS := optional
 
-LOCAL_CFLAGS := -Werror
+LOCAL_CFLAGS := -Werror -Wno-error=unused-parameter
 
 LOCAL_SRC_FILES:= \
   gl_code.cpp

opengl/tests/gl_jni/Android.mk

@@ -30,7 +30,7 @@ include $(CLEAR_VARS)
 # Optional tag would mean it doesn't get installed by default
 LOCAL_MODULE_TAGS := optional
 
-LOCAL_CFLAGS := -Werror
+LOCAL_CFLAGS := -Werror -Wno-error=unused-parameter
 
 LOCAL_SRC_FILES:= \
   gl_code.cpp

opengl/tests/gl_perfapp/Android.mk

@@ -33,7 +33,7 @@ include $(CLEAR_VARS)
 # Optional tag would mean it doesn't get installed by default
 LOCAL_MODULE_TAGS := optional
 
-LOCAL_CFLAGS := -Werror
+LOCAL_CFLAGS := -Werror -Wno-error=unused-parameter
 
 LOCAL_SRC_FILES:= \
   gl_code.cpp

opengl/tests/gldual/Android.mk

@@ -30,7 +30,7 @@ include $(CLEAR_VARS)
 # Optional tag would mean it doesn't get installed by default
 LOCAL_MODULE_TAGS := optional
 
-LOCAL_CFLAGS := -Werror
+LOCAL_CFLAGS := -Werror -Wno-error=unused-parameter
 
 LOCAL_SRC_FILES:= \
   gl_code.cpp