packages: set custom PKG_[CONFIGURE|CMAKE|MESON]_SCRIPT in configure_package()

When setting a custom build script (which must be relative to $PKG_BUILD), the
value should be set in configure_package() so that $PKG_BUILD is known, and also
because the path to the script will be validated prior to calling
pre_configure_$TARGET(), so the script variable must be configured once the pacakge
is sourced.

packages/addons/addon-depends/chrome-depends/icu/package.mk

@@ -26,7 +26,7 @@ configure_package() {
   PKG_CONFIGURE_OPTS_TARGET="--with-cross-build=$PKG_BUILD/.$HOST_NAME \
                              $PKG_ICU_OPTS"
 
-  PKG_CONFIGURE_SCRIPT="source/configure"
+  PKG_CONFIGURE_SCRIPT="${PKG_BUILD}/source/configure"
 }
 
 post_makeinstall_target() {

packages/devel/gettext/package.mk

@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 # Copyright (C) 2009-2016 Stephan Raue (stephan@openelec.tv)
+# Copyright (C) 2018-present Team LibreELEC (https://libreelec.tv)
 
 PKG_NAME="gettext"
 PKG_VERSION="0.19.8.1"
@@ -10,7 +11,8 @@ PKG_URL="http://ftp.gnu.org/pub/gnu/gettext/$PKG_NAME-$PKG_VERSION.tar.gz"
 PKG_DEPENDS_HOST="ccache:host"
 PKG_LONGDESC="A program internationalization library and tools."
 
-PKG_CONFIGURE_SCRIPT="gettext-tools/configure"
+configure_package() {
+  PKG_CONFIGURE_SCRIPT="${PKG_BUILD}/gettext-tools/configure"
 
   PKG_CONFIGURE_OPTS_HOST="--enable-static --disable-shared \
                            --disable-rpath \
@@ -21,3 +23,4 @@ PKG_CONFIGURE_OPTS_HOST="--enable-static --disable-shared \
                            --disable-native-java \
                            --disable-csharp \
                            --without-emacs"
+}

packages/linux-drivers/dvbhdhomerun/package.mk

@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 # Copyright (C) 2009-2016 Stephan Raue (stephan@openelec.tv)
+# Copyright (C) 2018-present Team LibreELEC (https://libreelec.tv)
 
 PKG_NAME="dvbhdhomerun"
 PKG_VERSION="20130704"
@@ -13,17 +14,11 @@ PKG_NEED_UNPACK="$LINUX_DEPENDS"
 PKG_LONGDESC="A linux DVB driver for the HDHomeRun TV tuner (http://www.silicondust.com)."
 PKG_IS_KERNEL_PKG="yes"
 
-PKG_CMAKE_SCRIPT="userhdhomerun/CMakeLists.txt"
-
-pre_make_target() {
-  ( cd ../kernel
-    LDFLAGS="" make dvb_hdhomerun KERNEL_DIR=$(kernel_path)
-    fix_module_depends dvb_hdhomerun_core.ko "dvb_core"
-  )
+configure_package() {
+  PKG_CMAKE_SCRIPT="${PKG_BUILD}/userhdhomerun/CMakeLists.txt"
 }
 
 pre_configure_target() {
-
   # use it here to be sure libhdhomerun is already built
   PKG_CMAKE_OPTS_TARGET="-DLIBHDHOMERUN_PATH=$(ls -d $BUILD/libhdhomerun-*/)"
 
@@ -34,6 +29,13 @@ pre_configure_target() {
   sed -i "s|/etc/dvbhdhomerun|/tmp/dvbhdhomerun|g" ../userhdhomerun/hdhomerun_controller.cpp
 }
 
+pre_make_target() {
+  ( cd ../kernel
+    LDFLAGS="" make dvb_hdhomerun KERNEL_DIR=$(kernel_path)
+    fix_module_depends dvb_hdhomerun_core.ko "dvb_core"
+  )
+}
+
 makeinstall_target() {
   cd $PKG_BUILD
     mkdir -p $INSTALL/$(get_full_module_dir)/hdhomerun