toolchain/toolchain-external/toolchain-external-custom: remove mentions of eglibc

eglibc is a thing of the past, stop mentioning it.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

toolchain/toolchain-external/toolchain-external-custom/Config.in.options

@@ -385,17 +385,11 @@ config BR2_TOOLCHAIN_EXTERNAL_CUSTOM_UCLIBC
 	  C library.
 
 config BR2_TOOLCHAIN_EXTERNAL_CUSTOM_GLIBC
-	bool "glibc/eglibc"
+	bool "glibc"
 	select BR2_TOOLCHAIN_EXTERNAL_GLIBC
 	help
 	  Select this option if your external toolchain uses the GNU C
-	  library (available from https://www.gnu.org/software/libc/)
-	  or its variant the eglibc library (http://www.eglibc.org/).
-
-	  Note: eglibc is a variant of glibc that (among other things)
-	  can be configured to exclude some of its features. Using a
-	  toolchain with eglibc configured to exclude key features may
-	  cause build failures to some packages.
+	  library (available from https://www.gnu.org/software/libc/).
 
 config BR2_TOOLCHAIN_EXTERNAL_CUSTOM_MUSL
 	bool "musl (experimental)"