glibc: needs host-bison

Since upstream commit 1faaf7035cabda101e1d6653bff7a539f201db91
("plural.c: improve reproducibility"), glibc now requires bison to be
available on the host for its build process. This is needed starting
with glibc 2.27.

Fixes:

  http://autobuild.buildroot.net/results/ca4d883793c1674d3a052edd5e56897f79683448/

Signed-off-by: Ryan Coe <bluemrp9@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/glibc/glibc.mk

@@ -28,7 +28,7 @@ GLIBC_ADD_TOOLCHAIN_DEPENDENCY = NO
 
 # Before glibc is configured, we must have the first stage
 # cross-compiler and the kernel headers
-GLIBC_DEPENDENCIES = host-gcc-initial linux-headers host-gawk
+GLIBC_DEPENDENCIES = host-gcc-initial linux-headers host-bison host-gawk
 
 GLIBC_SUBDIR = build