x11r7/xcb-util-keysyms: depends on host-pkgconf and libxcb

Fix build failure:
./configure: line 11453: /home/tetsuya/buildroot/br/output/host/usr/bin/pkg-config: No such file or directory
configure: error: in `/home/tetsuya/buildroot/br/output/build/xcb-util-keysyms-0.3.9':
configure: error: The pkg-config script could not be found or is too old.  Make sure it
is in your PATH or set the PKG_CONFIG environment variable to the full
path to pkg-config.

Fix build failure:
configure: error: Package requirements (xcb >= 1.4) were not met:

Signed-off-by: Fabio Porcedda <fabio.porcedda@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/x11r7/xcb-util-keysyms/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_XCB_UTIL_KEYSYMS
 	bool "xcb-util-keysyms"
+	select BR2_PACKAGE_LIBXCB
 	help
 	  The XCB util modules provides a number of libraries which sit on top
 	  of libxcb, the core X protocol library, and some of the extension

package/x11r7/xcb-util-keysyms/xcb-util-keysyms.mk

@@ -13,4 +13,6 @@ XCB_UTIL_KEYSYMS_LICENSE = MIT
 
 XCB_UTIL_KEYSYMS_INSTALL_STAGING = YES
 
+XCB_UTIL_KEYSYMS_DEPENDENCIES = host-pkgconf libxcb
+
 $(eval $(autotools-package))