Temporarily disable GC_SECTIONS

Using GC_SECTIONS results in broken USB device numbering since Circle
Step 43.

Disable until rsta2/circle#143 is merged or an alternative fix is
implemented.

Fixes #40.

Author: dwhinham

Config.mk

@@ -15,7 +15,7 @@ FLASHBAUD?=3000000
 USERBAUD?=115200
 
 # Enable section garbage collection
-GC_SECTIONS?=1
+GC_SECTIONS?=0
 
 CIRCLESTDLIBHOME=$(realpath external/circle-stdlib)
 CIRCLE_STDLIB_CONFIG=$(CIRCLESTDLIBHOME)/Config.mk