stm32f1: rtc: drop redundant ld script

Now that this is known targetting h103 board, drop the duped ld script.

Author: karlp

examples/stm32/f1/stm32-h103/rtc/Makefile

@@ -18,6 +18,7 @@
 ##
 
 BINARY = rtc
+LDSCRIPT = ../stm32-h103.ld
 
 include ../../Makefile.include