gdb: add host-texinfo dependency for Git versions

Just like for binutils, gdb versions pulled from Git want to
regenerate their documentation, and none of the MAKEINFO tricks we've
tried worked properly, so we're simply adding host-texinfo as a
dependency.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gdb/gdb.mk

@@ -24,11 +24,13 @@ endif
 ifeq ($(BR2_arc),y)
 GDB_SITE = $(call github,foss-for-synopsys-dwc-arc-processors,gdb,$(GDB_VERSION))
 GDB_SOURCE = gdb-$(GDB_VERSION).tar.gz
+GDB_FROM_GIT = y
 endif
 
 ifeq ($(BR2_microblaze),y)
 GDB_SITE = $(call github,Xilinx,gdb,$(GDB_VERSION))
 GDB_SOURCE = gdb-$(GDB_VERSION).tar.gz
+GDB_FROM_GIT = y
 endif
 
 ifeq ($(GDB_VERSION),6.7.1-avr32-2.1.5)
@@ -126,6 +128,10 @@ HOST_GDB_CONF_OPT = \
 	--without-included-gettext \
 	--disable-sim
 
+ifeq ($(GDB_FROM_GIT),y)
+HOST_GDB_DEPENDENCIES += host-texinfo
+endif
+
 # legacy $arch-linux-gdb symlink
 define HOST_GDB_ADD_SYMLINK
 	cd $(HOST_DIR)/usr/bin && \