component/gettext: disable extra warnings

Those warnings are breaking compilation on Fedora:

[ 1280s] libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -I. -I. -I.. -I.. -Iglib -DIN_LIBTEXTSTYLE -DLIBXML_STATIC -I./libcroco -DDEPENDS_ON_LIBICONV=1 -I/home/abuild/rpmbuild/BUILD/sn_1.10.5+1.0.346+1/slapos/build/opt/slapos/parts/libxml2/include -I/home/abuild/rpmbuild/BUILD/sn_1.10.5+1.0.346+1/slapos/build/opt/slapos/parts/zlib/include -I/home/abuild/rpmbuild/BUILD/sn_1.10.5+1.0.346+1/slapos/build/opt/slapos/parts/ncurses/include -fanalyzer -Wall -Warith-conversion -Wcast-align=strict -Wdate-time -Wdisabled-optimization -Wdouble-promotion -Wduplicated-branches -Wduplicated-cond -Wextra -Wformat-signedness -Winit-self -Winvalid-pch -Wlogical-op -Wmissing-include-dirs -Wnested-externs -Wnull-dereference -Wopenmp-simd -Woverlength-strings -Wpacked -Wpointer-arith -Wstack-protector -Wstrict-overflow -Wsuggest-attribute=format -Wsuggest-final-methods -Wsuggest-final-types -Wsync-nand -Wsystem-headers -Wtrampolines -Wuninitialized -Wunknown-pragmas -Wunsafe-loop-optimizations -Wvariadic-macros -Wvector-operation-performance -Wwrite-strings -Warray-bounds=2 -Wattribute-alias=2 -Wbidi-chars=any,ucn -Wformat-overflow=2 -Wformat=2 -Wformat-truncation=2 -Wimplicit-fallthrough=5 -Wshift-overflow=2 -Wuse-after-free=3 -Wunused-const-variable=2 -Wvla-larger-than=4031 -Wno-analyzer-malloc-leak -Wno-empty-body -Wno-analyzer-double-fclose -Wno-analyzer-double-free -Wno-analyzer-null-argument -Wno-analyzer-null-dereference -Wno-analyzer-use-of-uninitialized-value -Wno-cast-align -Wno-format-nonliteral -Wno-sign-compare -Wno-type-limits -Wno-unused-parameter -Wno-clobbered -Wshadow=local -Wno-cast-function-type -Wno-duplicated-cond -Wno-format -Wno-implicit-fallthrough -Wno-null-dereference -Wno-suggest-attribute=format -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -mbranch-protection=standard -fasynchronous-unwind-tables -fstack-clash-protection -c libcroco/cr-additional-sel.c  -fPIC -DPIC -o libcroco/.libs/rpl_la-cr-additional-sel.o
[ 1280s] cc1: error: '-Wformat-security' ignored without '-Wformat' [-Werror=format-security]
[ 1280s] cc1: some warnings being treated as errors