[PATCH] build: fix grep v3.8 "stray \" warning

[Andre Heider]

This fixes the reoccuring warning:
grep: warning: stray \ before /

Signed-off-by: Andre Heider <a.heider at gmail.com>
---
 Makefile                  | 2 +-
 target/sdk/files/Makefile | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 3ac110367d..c1b0b0a840 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ $(if $(findstring $(space),$(TOPDIR)),$(error ERROR: The path to the OpenWrt dir
 
 world:
 
-DISTRO_PKG_CONFIG:=$(shell $(TOPDIR)/scripts/command_all.sh pkg-config | grep -E '\/usr' | head -n 1)
+DISTRO_PKG_CONFIG:=$(shell $(TOPDIR)/scripts/command_all.sh pkg-config | grep -E '/usr' | head -n 1)
 export PATH:=$(TOPDIR)/staging_dir/host/bin:$(PATH)
 
 ifneq ($(OPENWRT_BUILD),1)
diff --git a/target/sdk/files/Makefile b/target/sdk/files/Makefile
index a710ca5f51..d1d97d4287 100644
--- a/target/sdk/files/Makefile
+++ b/target/sdk/files/Makefile
@@ -14,7 +14,7 @@ export TOPDIR LC_ALL LANG SDK
 
 world:
 
-DISTRO_PKG_CONFIG:=$(shell $(TOPDIR)/scripts/command_all.sh pkg-config | grep -E '\/usr' | head -n 1)
+DISTRO_PKG_CONFIG:=$(shell $(TOPDIR)/scripts/command_all.sh pkg-config | grep -E '/usr' | head -n 1)
 export PATH:=$(TOPDIR)/staging_dir/host/bin:$(PATH)
 
 ifneq ($(OPENWRT_BUILD),1)
-- 
2.35.1