configure: Adding gcc options: -O2 -pipe -fstack-protector-strong -fno-strict-aliasing -MD -W -Wall -Wimplicit -Wshadow -Wpointer-arith -Wcast-align -Wwrite-strings -Waggregate-return -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Wmissing-declarations -Wuninitialized