in PATH seen by make then most likely for a very good reason. Set your PATH accordingly if you need /bin or /usr/local/bin et al.
# Strip off the annoying quoting
STAGING_DIR:=$(strip $(subst ",, $(BR2_STAGING_DIR)))
#"
-TARGET_PATH=$(STAGING_DIR)/bin:$(TOOL_BUILD_DIR)/bin:/bin:/sbin:/usr/bin:/usr/sbin:$(PATH)
+TARGET_PATH=$(STAGING_DIR)/bin:$(TOOL_BUILD_DIR)/bin:$(PATH)
IMAGE:=$(BASE_DIR)/rootfs.$(ARCH)$(ARCH_FPU_SUFFIX)
REAL_GNU_TARGET_NAME=$(OPTIMIZE_FOR_CPU)$(GNU_TARGET_SUFFIX)
GNU_TARGET_NAME=$(OPTIMIZE_FOR_CPU)-linux