librecovery: Remove -Wno-unused-parameter and add -Wall.

Test: mmma bootable/recovery
Change-Id: I5598d32bebb9dbda4a183a1502e0b7dc4918392e
diff --git a/Android.mk b/Android.mk
index adf478f..5e2ddde 100644
--- a/Android.mk
+++ b/Android.mk
@@ -45,7 +45,7 @@
 include $(CLEAR_VARS)
 LOCAL_SRC_FILES := \
     install.cpp
-LOCAL_CFLAGS := -Wno-unused-parameter -Werror
+LOCAL_CFLAGS := -Wall -Werror
 LOCAL_CFLAGS += -DRECOVERY_API_VERSION=$(RECOVERY_API_VERSION)
 
 ifeq ($(AB_OTA_UPDATER),true)