target: zephyr: Switch to MinSizeRel build type following mainline. (#1527)

Fixes #1526.

JerryScript-DCO-1.0-Signed-off-by: Paul Sokolovsky [email protected]

Author: pfalcon

targets/zephyr/Makefile.zephyr

@@ -81,7 +81,7 @@ endif
 	 -DFEATURE_VALGRIND=OFF \
 	 -DFEATURE_PROFILE=$(JERRYPROFILE) \
 	 -DFEATURE_ERROR_MESSAGES=ON \
-	 -DCMAKE_BUILD_TYPE=Release \
+	 -DCMAKE_BUILD_TYPE=MinSizeRel \
 	 -DCMAKE_VERBOSE_MAKEFILE=$(V) \
 	 -DMEM_HEAP_SIZE_KB=$(JERRYHEAP) \
 	 -DEXTERNAL_CMAKE_C_COMPILER="$(subst ccache ,,$(CC))" \