[openwrt/openwrt] tools/squashfs4: enable parallel builds

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/3efd49a588d7d7c800b03551552d120b8af44bb7

commit 3efd49a588d7d7c800b03551552d120b8af44bb7
Author: Linhui Liu <liulinhui36 at gmail.com>
AuthorDate: Fri Mar 31 21:34:01 2023 +0800

    tools/squashfs4: enable parallel builds
    
    Run `time make tools/squashfs4/{clean,compile} -j$(nproc)`
    Before:
    real    0m8.803s
    user    0m12.415s
    sys     0m1.317s
    After:
    real    0m13.781s
    user    0m13.290s
    sys     0m1.528s
    
    Signed-off-by: Linhui Liu <liulinhui36 at gmail.com>
---
 tools/squashfs4/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/squashfs4/Makefile b/tools/squashfs4/Makefile
index 7c8bcf1a72..bcbe98e0dd 100644
--- a/tools/squashfs4/Makefile
+++ b/tools/squashfs4/Makefile
@@ -17,11 +17,13 @@ PKG_SOURCE_DATE:=2022-03-17
 PKG_SOURCE_VERSION:=afdd63fc386919b4aa40d573b0a6069414d14317
 PKG_MIRROR_HASH:=59c294e00ddfc1f4bda658c7567584ce35fdd479c413ebdb1376981b27737be1
 
+HOST_BUILD_PARALLEL:=1
+
 include $(INCLUDE_DIR)/host-build.mk
 
 define Host/Compile
 	+$(HOST_MAKE_VARS) \
-	$(MAKE) -C $(HOST_BUILD_DIR)/squashfs-tools \
+	$(MAKE) $(HOST_JOBS) -C $(HOST_BUILD_DIR)/squashfs-tools \
 		XZ_SUPPORT=1 \
 		LZMA_XZ_SUPPORT=1 \
 		EXTRA_CFLAGS="-I$(STAGING_DIR_HOST)/include" \