Added ldflags to the platforms.txt as an option.
Added ldflags to the platforms.txt as an option.


Former-commit-id: 2083fe922c23e3852c4dcc19952875be6c6b59d6

majenkotech/chipKIT-core,adamwolf/chipKIT-core,majenkotech/chipKIT-core,majenkotech/chipKIT-core,adamwolf/chipKIT-core,EmbeddedMan/chipKIT-core,ricklon/chipKIT-core,majenkotech/chipKIT-core,chipKIT32/chipkit-core,UECIDE/chipKIT-core,ricklon/chipKIT-core,majenkotech/chipKIT-core,chipKIT32/chipkit-core,chipKIT32/chipkit-core,adamwolf/chipKIT-core,adamwolf/chipKIT-core,adamwolf/chipKIT-core,pontech/chipKIT-core,pontech/chipKIT-core,pontech/chipKIT-core,EmbeddedMan/chipKIT-core,majenkotech/chipKIT-core,EmbeddedMan/chipKIT-core,pontech/chipKIT-core,EmbeddedMan/chipKIT-core,UECIDE/chipKIT-core,pontech/chipKIT-core,ricklon/chipKIT-core,ricklon/chipKIT-core,UECIDE/chipKIT-core,UECIDE/chipKIT-core,adamwolf/chipKIT-core,UECIDE/chipKIT-core,ricklon/chipKIT-core,EmbeddedMan/chipKIT-core,EmbeddedMan/chipKIT-core,majenkotech/chipKIT-core,ricklon/chipKIT-core,adamwolf/chipKIT-core,EmbeddedMan/chipKIT-core,pontech/chipKIT-core,chipKIT32/chipkit-core,chipKIT32/chipkit-core,pontech/chipKIT-core