cleanup docker build and travis file

.travis.yml

@@ -4,11 +4,10 @@ install:
   - sudo add-apt-repository ppa:terry.guo/gcc-arm-embedded -y
   - sudo apt-get update
   - sudo apt-get install -y build-essential git gcc-arm-none-eabi
-  - git clone https://github.com/libopencm3/libopencm3
 
 script:
   - make -C libopencm3
-  - TOOLCHAIN_DIR=libopencm3 make
-  - TOOLCHAIN_DIR=../libopencm3 make -C firmware
-  - TOOLCHAIN_DIR=../libopencm3 make -C bootloader
-  - TOOLCHAIN_DIR=../libopencm3 make -C demo
+  - make
+  - make -C firmware
+  - make -C bootloader
+  - make -C demo

firmware-docker-build.sh

@@ -8,13 +8,10 @@ docker run -t -v $(pwd)/output:/output $IMAGETAG /bin/sh -c "\
 	cd trezor-mcu && \
 	git checkout $FIRMWARETAG && \
 	git submodule update --init && \
-	cd libopencm3 &&
+	make -C libopencm3 && \
 	make && \
-	cd .. && \
-	make && \
-	cd firmware && \
-	make && \
-	cp trezor.bin /output/trezor-$FIRMWARETAG.bin"
+	make -C firmware && \
+	cp firmware/trezor.bin /output/trezor-$FIRMWARETAG.bin"
 
 echo "---------------------"
 echo "Firmware fingerprint:"