toolchain: glibc: increase min kernel version to 5.15

The purpose of this is to remove all of the compatibility code that is
normally compiled into glibc for kernels < 5.15 from our build. Only
Linux kernels >= 5.15 will be supported.

Signed-off-by: Nick Hainke <[email protected]>

toolchain/glibc/common.mk

@@ -64,7 +64,7 @@ GLIBC_CONFIGURE:= \
 		  $(if $(CONFIG_PKG_CC_STACKPROTECTOR_REGULAR),--enable-stack-protector=yes) \
 		  $(if $(CONFIG_PKG_CC_STACKPROTECTOR_STRONG),--enable-stack-protector=strong) \
 		  $(if $(CONFIG_PKG_RELRO_FULL),--enable-bind-now) \
-		--enable-kernel=5.10.0
+		--enable-kernel=5.15.0
 
 export libc_cv_ssp=no
 export libc_cv_ssp_strong=no