STM32F1. Removed support / worksround for IDE versions before 1.6.3, with removal of platform.rewrite.keys.txt and update of compiler path in platforms.txt

Author: rogerclarkmelbourne

STM32F1/platform.rewrite.keys.txt

@@ -14,7 +14,7 @@ compiler.warning_flags.all=-Wall -Wextra -DDEBUG_LEVEL=DEBUG_ALL
 
 # compiler variables
 # ----------------------
-compiler.path={runtime.ide.path}/hardware/tools/gcc-arm-none-eabi-4.8.3-2014q1/bin/
+compiler.path={runtime.tools.arm-none-eabi-gcc.path}/bin/
 compiler.c.cmd=arm-none-eabi-gcc
 compiler.c.flags=-c -g -Os {compiler.warning_flags} -MMD -ffunction-sections -fdata-sections -nostdlib --param max-inline-insns-single=500 -DBOARD_{build.variant} -D{build.vect} -DERROR_LED_PORT={build.error_led_port} -DERROR_LED_PIN={build.error_led_pin} 
 compiler.c.elf.cmd=arm-none-eabi-g++