eglibc: fix typo

For some reason, a '+' sign was left at the beginning of a line in
eglibc.mk. Noticed by Gustavo Zacarias.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/eglibc/eglibc.mk

@@ -19,7 +19,7 @@ EGLIBC_SUBDIR = build
 
 EGLIBC_INSTALL_STAGING = YES
 
-+EGLIBC_INSTALL_STAGING_OPT = install_root=$(STAGING_DIR) install
+EGLIBC_INSTALL_STAGING_OPT = install_root=$(STAGING_DIR) install
 
 # Even though we use the autotools-package infrastructure, we have to
 # override the default configure commands for several reasons: