Build verbose generates very long command line

[manu-st]

When I perform a cross compilation for arm using the verbose flag the output window is barely readable. The main cause is that some arguments are replicated many times. For example, building libryujit.so will have 115 times the following arguments:

-target arm-linux-gnueabihf -B /home/local/Microsoft/coreclr/cross/rootfs/arm/usr/lib/gcc/arm-linux-gnueabihf -L/home/local/Microsoft/coreclr/cross/rootfs/arm/lib/arm-linux-gnueabihf --sysroot=/home/local/Microsoft/coreclr/cross/rootfs/arm  

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