[openwrt/openwrt] toolchain/gdb: use STAGING_DIR_HOST instead of hardcoding default

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/d10e6591d1523738852dd0ab625df1f9ea7fc63c

commit d10e6591d1523738852dd0ab625df1f9ea7fc63c
Author: Christian Marangi <ansuelsmth at gmail.com>
AuthorDate: Fri Dec 2 20:33:14 2022 +0100

    toolchain/gdb: use STAGING_DIR_HOST instead of hardcoding default
    
    Use STAGING_DIR_HOST to reference staging host directory instead of
    hardcoding it to default path.
    
    Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
---
 toolchain/gdb/Makefile | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/toolchain/gdb/Makefile b/toolchain/gdb/Makefile
index 4587c591f4..70a4fa5902 100644
--- a/toolchain/gdb/Makefile
+++ b/toolchain/gdb/Makefile
@@ -30,10 +30,10 @@ HOST_CONFIGURE_ARGS = \
 	--build=$(GNU_HOST_NAME) \
 	--host=$(GNU_HOST_NAME) \
 	--target=$(REAL_GNU_TARGET_NAME) \
-	--with-gmp=$(TOPDIR)/staging_dir/host \
-	--with-mpfr=$(TOPDIR)/staging_dir/host \
-	--with-mpc=$(TOPDIR)/staging_dir/host \
-	--with-expat=$(TOPDIR)/staging_dir/host \
+	--with-gmp=$(STAGING_DIR_HOST) \
+	--with-mpfr=$(STAGING_DIR_HOST) \
+	--with-mpc=$(STAGING_DIR_HOST) \
+	--with-expat=$(STAGING_DIR_HOST) \
 	--disable-werror \
 	--without-uiout \
 	--enable-tui --disable-gdbtk --without-x \