package/pkgconf: disable ccache for host package

We need to disable ccache when building host-pkgconf as the upcoming
ccache update depends on host-pkgconf indirectly due to host-cmake
depending on host-pkgconf which will be required due to host-ccache
migrating from autotools to cmake package infrastructure.

Note: host-pkgconf does not need _AUTORECONF = YES, so it doesnot depend
on any of host-gettext, host-automake, host-autoconf, or host-libtool.
If it ever nees to in the future, then those should also be made to
build without ccache.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
[yann.morin.1998@free.fr: add note]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/pkgconf/pkgconf.mk

@@ -11,6 +11,11 @@ PKGCONF_LICENSE = pkgconf license
 PKGCONF_LICENSE_FILES = COPYING
 PKGCONF_CPE_ID_VENDOR = pkgconf
 
+# We are a ccache dependency, so we can't use ccache
+HOST_PKGCONF_CONF_ENV = \
+	CC="$(HOSTCC_NOCCACHE)" \
+	CXX="$(HOSTCXX_NOCCACHE)"
+
 PKG_CONFIG_HOST_BINARY = $(HOST_DIR)/bin/pkg-config
 
 define PKGCONF_LINK_PKGCONFIG