package/glibc: bump to version 2.28

https://www.sourceware.org/ml/libc-alpha/2018-08/msg00003.html

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/glibc/glibc.hash

@@ -1,5 +1,5 @@
 # Locally calculated (fetched from Github)
-sha256  33189b3f10c88730a1f686fac794bc01f31765f12ffd75bc5e8a0f2a690d217a     glibc-glibc-2.27-57-g6c99e37f6fb640a50a3113b2dbee5d5389843c1e.tar.gz
+sha256  877c7b4741501d1762af8ef1a2518bdf2d722947d2e8d48b203e2d83cc600bca     glibc-glibc-2.28.tar.gz
 # Locally calculated (fetched from Github)
 sha256  e08ab67b2db2d0f0e8f3311d23c54fb8f6d4c1ef6fa0b4047fd5da400e3ce9de     glibc-arc-2018.03-release.tar.gz
 

package/glibc/glibc.mk

@@ -10,7 +10,7 @@ GLIBC_SITE = $(call github,foss-for-synopsys-dwc-arc-processors,glibc,$(GLIBC_VE
 else
 # Generate version string using:
 #   git describe --match 'glibc-*' --abbrev=40 origin/release/MAJOR.MINOR/master
-GLIBC_VERSION = glibc-2.27-57-g6c99e37f6fb640a50a3113b2dbee5d5389843c1e
+GLIBC_VERSION = glibc-2.28
 # Upstream doesn't officially provide an https download link.
 # There is one (https://sourceware.org/git/glibc.git) but it's not reliable,
 # sometimes the connection times out. So use an unofficial github mirror.