Android build: enabling optimizations based on the value of NDK_BUILD
Setting APP_CFLAGS in Application.mk
Android build.sh: passing NDK_DEBUG
Disabled DSQLITE_ENABLE_COLUMN_METADATA
Android build: using -O3 in Release since sqlite doesn’t support -ffast-math
Added -j 4 to ndk-build in build.sh
Merge pull request #43 from mindsnacks/feature/android-build-optimization

Android build: enabling optimizations based on the value of NDK_BUILD