debug/gdb: Add CUSTOM version and CUSTOM_LOCATION config options and GetCustom

CUSTOM_LOCATION config options only presented in menuconfig if component
CUSTOM version selected.

Signed-off-by: "David Holsgrove" <david.holsgrove@xilinx.com>
[yann.morin.1998@free.fr: don't patch custom dir location]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Message-Id: <9ea1b5021fc77582867f.1349931197@localhost.localdomain>
PatchWork-Id: 190791

diff -durN gcc-4.4.5.orig/libiberty/Makefile.in gcc-4.4.5/libiberty/Makefile.in

--- gcc-4.4.5.orig/libiberty/Makefile.in	2008-10-22 15:30:19.000000000 +0200

+++ gcc-4.4.5/libiberty/Makefile.in	2010-10-09 23:02:28.000000000 +0200

@@ -227,6 +227,7 @@

 	  $(AR) $(AR_FLAGS) $(TARGETLIB) \

 	    $(REQUIRED_OFILES) $(EXTRA_OFILES) $(LIBOBJS); \

 	  $(RANLIB) $(TARGETLIB); \

+	  cp $(TARGETLIB) ../ ; \

 	  cd ..; \

 	else true; fi