[2.0.x][LPC176x, STSTM32] Target previous pio platform versions#11506

Merged

thinkyhead merged 1 commit intoMarlinFirmware:bugfix-2.0.xfrom

p3p:pr_bf2_lpc_fixbuild

Aug 10, 2018

Commits on Aug 9, 2018

Target specific nxplpc and ststm32 pio platform versions to fix build
p3p
committed