support/dependencies/dependencies.sh: require FileHandle perl package for syslinux

syslinux needs FileHandle module:

Can't locate FileHandle.pm in @INC (you may need to install the FileHandle module) (@INC contains: /home/buildroot/autobuild/instance-0/output-1/host/lib/perl /usr/local/lib64/perl5/5.36 /usr/local/share/perl5/5.36 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5) at /home/buildroot/autobuild/instance-0/output-1/build/syslinux-6.03/com32/lib/makeerrlist.pl line 8.
BEGIN failed--compilation aborted at /home/buildroot/autobuild/instance-0/output-1/build/syslinux-6.03/com32/lib/makeerrlist.pl line 8.
/home/buildroot/autobuild/instance-0/output-1/host/bin/i586-buildroot-linux-gnu-gcc -Wp,-MT,errlist.o,-MD,./.errlist.o.d -Os -march=i386 -falign-functions=0 -falign-jumps=0 -falign-labels=0 -ffast-math -fomit-frame-pointer -std=gnu99 -m32 -mpreferred-stack-boundary=2 -fno-stack-protector -fwrapv -freg-struct-return -fPIC -fno-exceptions -fno-asynchronous-unwind-tables -fno-strict-aliasing -falign-functions=0 -falign-jumps=0 -falign-labels=0 -falign-loops=0 -g -D__COM32__ -D__FIRMWARE_BIOS__ -nostdinc -iwithprefix include -I. -I/home/buildroot/autobuild/instance-0/output-1/build/syslinux-6.03/com32/lib/sys -I/home/buildroot/autobuild/instance-0/output-1/build/syslinux-6.03/com32/lib/../include -I/home/buildroot/autobuild/instance-0/output-1/build/syslinux-6.03/com32/include/sys -I/home/buildroot/autobuild/instance-0/output-1/build/syslinux-6.03/core/include -I/home/buildroot/autobuild/instance-0/output-1/build/syslinux-6.03/com32/lib/ -I/home/buildroot/autobuild/instance-0/output-1/bu
 ild/syslinux-6.03/com32/lib/sys/module -I/home/buildroot/autobuild/instance-0/output-1/build/syslinux-6.03/bios/com32/lib//../.. -W -Wall -Wstrict-prototypes  -Wpointer-arith -Wwrite-strings -Wstrict-prototypes -Winline -DDYNAMIC_CRC_TABLE -DPNG_NO_CONSOLE_IO -DPNG_NO_WRITE_SUPPORTED -DPNG_NO_MNG_FEATURES -DPNG_NO_READ_tIME -DPNG_NO_WRITE_tIME -mregparm=3 -DREGPARM=3 -c -o errlist.o errlist.c
cc1: fatal error: errlist.c: No such file or directory

Fixes:
 - http://autobuild.buildroot.org/results/de88089888b2ca354b28af3550abf846560da7d5

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 474196d6bb410c0a9f5e1c8bb7018594a29a57bb)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/dependencies/dependencies.sh

@@ -307,6 +307,10 @@ if grep -q -E '^BR2_PACKAGE_(WEBKITGTK|WPEWEBKIT)=y' $BR2_CONFIG ; then
     required_perl_modules="${required_perl_modules} JSON::PP"
 fi
 
+if grep -q ^BR2_TARGET_SYSLINUX=y $BR2_CONFIG ; then
+    required_perl_modules="$required_perl_modules FileHandle"
+fi
+
 # This variable will keep the modules that are missing in your system.
 missing_perl_modules=""