package/gdb: move patch directory
commit 9cf4964da56863dfe4ce729c32400bd9acf25ee7 forgot to move patch directory.
Fixes:
https://gitlab.com/free-electrons/toolchains-builder/-/jobs/95552306
Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>