pico needs also some support

Author: rgrr

cmake/preload/toolchains/pico_arm_cortex_m0plus_clang.cmake

@@ -1,7 +1,7 @@
 set(CMAKE_SYSTEM_PROCESSOR cortex-m0plus)
 
 # these are all the directories under LLVM embedded toolchain for ARM (newlib or pibolibc) and under llvm_libc
-set(PICO_CLANG_RUNTIMES armv6m_soft_nofp armv6m-unknown-none-eabi)
+set(PICO_CLANG_RUNTIMES armv6m_soft_nofp armv6m_soft_nofp_size armv6m-unknown-none-eabi)
 
 set(PICO_COMMON_LANG_FLAGS "--target=armv6m-none-eabi -mfloat-abi=soft -march=armv6m")