modemmanager: fix compilation

MM has a problem with cross-compiling. It needs to run some
tools during compilation (glib-mkenums & gdbus-codegen) but uses
pkg-config to detect them. But like this it finds the wrong tools, the
ones in $(STAGING_DIR). The correct tools are in
$(STAGING_DIR_HOSTPKG)/bin.

As a workaround this commit patches configure.ac so the correct tools
are used, the ones from glib2/host. The latter is also added to
PKG_BUILD_DEPENDS to reflect this.

libxslt/host is also added to PKG_BUILD_DEPENDS and the related
RequireCommand call is removed. This is OK to do since we have
libxslt/host available since a few days ago.

Resolves #10249

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

net/modemmanager/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=modemmanager
 PKG_VERSION:=1.10.6
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=ModemManager-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=https://www.freedesktop.org/software/ModemManager
@@ -23,6 +23,10 @@ LICENSE_FILES:=COPYING
 PKG_INSTALL:=1
 PKG_BUILD_PARALLEL:=1
 
+PKG_BUILD_DEPENDS:=glib2/host libxslt/host
+
+PKG_FIXUP:=autoreconf
+
 include $(INCLUDE_DIR)/package.mk
 
 define Package/modemmanager/config
@@ -73,6 +77,10 @@ define Build/Prepare
 	( cd "$(PKG_BUILD_DIR)"; \
 		printf "all:\ninstall:\n" >po/Makefile.in.in; \
 	)
+	$(SED) 's|^\(GLIB_MKENUMS\)=.*|\1=$(STAGING_DIR_HOSTPKG)/bin/glib-mkenums|' \
+		$(PKG_BUILD_DIR)/configure.ac
+	$(SED) 's|^\(GDBUS_CODEGEN\)=.*|\1=$(STAGING_DIR_HOSTPKG)/bin/gdbus-codegen|' \
+		$(PKG_BUILD_DIR)/configure.ac
 endef
 
 define Build/InstallDev
@@ -125,8 +133,4 @@ define Package/modemmanager/install
 	$(INSTALL_BIN) ./files/modemmanager.proto $(1)/lib/netifd/proto/modemmanager.sh
 endef
 
-$(eval $(call RequireCommand,xsltproc, \
-        $(PKG_NAME) requires xsltproc installed on the host-system. \
-))
-
 $(eval $(call BuildPackage,modemmanager))