add missing wildcards to linker script to fix build with some toolchains
add missing wildcards to linker script to fix build with some toolchains

the linker script was omitting data sections with names like .data.impure_data,
.data.impure_ptr, which some toolchains produce for libc's impure data
structures, and this led to undefined behavior and faults at runtime.  thanks
to Erik Moe for reporting this bug and providing helpful binaries and dumps.

vsergeev/arm-bmw-sw,vsergeev/arm-bmw-sw,vsergeev/arm-bmw-sw