package/brotli: fix pkg-config

package/brotli: fix pkg-config

brotli pkg-config files are broken since version 1.0.8 and
https://github.com/google/brotli/commit/31754d4ffce14153b5c2addf7a11019ec23f51c1

This raise static build failures with all packages using brotli,
fontconfig or freetype such as fbterm:

-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os   -static -static  -static -o fbterm fbterm-fbconfig.o fbterm-fbio.o fbterm-fbshell.o fbterm-fbshellman.o fbterm-fbterm.o fbterm-font.o fbterm-input.o fbterm-mouse.o fbterm-screen.o fbterm-improxy.o fbterm-screen_render.o fbterm-fbdev.o fbterm-vesadev.o lib/libshell.a -L/srv/storage/autobuild/run/instance-1/output-1/host/bin/../arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib -lfreetype -lbz2 -L/srv/storage/autobuild/run/instance-1/output-1/host/bin/../arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib -L/srv/storage/autobuild/run/instance-1/output-1/host/bin/../arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib -lz -lpng16 -lz -R/srv/storage/autobuild/run/instance-1/output-1/host/bin/../arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib -lbrotlidec -L/srv/storage/autobuild/run/instance-1/output-1/host/bin/../arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib -R/srv/storage/autobuild/run/instance-1/output-1/host/bin/../arm-buil
 droot-linux-uclibcgnueabihf/sysroot/usr/lib -lbrotlicommon  -L/srv/storage/autobuild/run/instance-1/output-1/host/bin/../arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib -lfontconfig -lfreetype -lbz2 -L/srv/storage/autobuild/run/instance-1/output-1/host/bin/../arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib -L/srv/storage/autobuild/run/instance-1/output-1/host/bin/../arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib -lz -lpng16 -lz -R/srv/storage/autobuild/run/instance-1/output-1/host/bin/../arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib -lbrotlidec -L/srv/storage/autobuild/run/instance-1/output-1/host/bin/../arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib -R/srv/storage/autobuild/run/instance-1/output-1/host/bin/../arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib -lbrotlicommon -L/srv/storage/autobuild/run/instance-1/output-1/host/bin/../arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib -luuid -lexpat   -lutil -lutil
arm-linux-g++.br_real: error: unrecognized command line option '-R'

Fixes:
 - http://autobuild.buildroot.org/results/21ede59686d4998c9e643ea874396a11b1c0df93

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>