Revert "Disable -Werror for now"

This reverts commit 5e0c2e122300e7a6289b3bd08044f9cf1dbdef05.

examples/make.mk

@@ -91,6 +91,7 @@ CFLAGS += \
   -Wstrict-overflow \
   -Wall \
   -Wextra \
+  -Werror \
   -Wfatal-errors \
   -Werror-implicit-function-declaration \
   -Wfloat-equal \
@@ -101,8 +102,7 @@ CFLAGS += \
   -Wmissing-format-attribute \
   -Wunreachable-code \
   -Wcast-align \
-  -Wcast-function-type \
-  # -Werror disable for now\
+  -Wcast-function-type
 
 # Debugging/Optimization
 ifeq ($(DEBUG), 1)