toolchain: glibc: Increase minimum kernel version to 5.4

Increase the minimum kernel version needed by the glibc compiled for
OpenWrt to version 5.4. With this setting the glibc build will remove
all code needed to support older kernel versions.

Signed-off-by: Hauke Mehrtens <[email protected]>

toolchain/glibc/common.mk

@@ -63,7 +63,7 @@ GLIBC_CONFIGURE:= \
 		--$(if $(CONFIG_SOFT_FLOAT),without,with)-fp \
 		  $(if $(CONFIG_PKG_CC_STACKPROTECTOR_REGULAR),--enable-stack-protector=yes) \
 		  $(if $(CONFIG_PKG_CC_STACKPROTECTOR_STRONG),--enable-stack-protector=strong) \
-		--enable-kernel=4.14.0
+		--enable-kernel=5.4.0
 
 export libc_cv_ssp=no
 export libc_cv_ssp_strong=no