bare-arm, stmhal: Fix --nostdlib to -nostdlib

-nostdlib is the correct option, gcc recognizes the double dash version
when in link-only mode, but not when compiling.
Signed-off-by: Sven Wegener <sven.wegener@stealer.net>

bare-arm/Makefile

@@ -22,7 +22,7 @@ else
 CFLAGS += -Os -DNDEBUG
 endif
 
-LDFLAGS = --nostdlib -T stm32f405.ld
+LDFLAGS = -nostdlib -T stm32f405.ld
 LIBS =
 
 SRC_C = \

stmhal/Makefile

@@ -53,7 +53,7 @@ else
 COPT += -Os -DNDEBUG
 endif
 
-LDFLAGS = --nostdlib -T stm32f405.ld -Map=$(@:.elf=.map) --cref
+LDFLAGS = -nostdlib -T stm32f405.ld -Map=$(@:.elf=.map) --cref
 LIBS =
 
 # uncomment this if you want libgcc