community/ocaml-lablgtk: fix build by disabling -fno-common

Currently no patch for it:

/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ml_gdk.o:(.bss+0x0): multiple definition of `ml_table_extension_events'; ml_gdkpixbuf.o:(.bss+0x0): first defined here
/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ml_gtk.o:(.bss+0x0): multiple definition of `ml_table_extension_events'; ml_gdkpixbuf.o:(.bss+0x0): first defined here
/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ml_gtkbin.o:(.bss+0x0): multiple definition of `ml_table_extension_events'; ml_gdkpixbuf.o:(.bss+0x0): first defined here
/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ml_gtkbroken.o:(.bss+0x0): multiple definition of `ml_table_extension_events'; ml_gdkpixbuf.o:(.bss+0x0): first defined here
/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ml_gtkbutton.o:(.bss+0x0): multiple definition of `ml_table_extension_events'; ml_gdkpixbuf.o:(.bss+0x0): first defined here
/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ml_gtkassistant.o:(.bss+0x0): multiple definition of `ml_table_extension_events'; ml_gdkpixbuf.o:(.bss+0x0): first defined here
/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ml_gtkedit.o:(.bss+0x0): multiple definition of `ml_table_extension_events'; ml_gdkpixbuf.o:(.bss+0x0): first defined here
/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ml_gtklist.o:(.bss+0x0): multiple definition of `ml_table_extension_events'; ml_gdkpixbuf.o:(.bss+0x0): first defined here
/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ml_gtkmenu.o:(.bss+0x0): multiple definition of `ml_table_extension_events'; ml_gdkpixbuf.o:(.bss+0x0): first defined here
/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ml_gtkmisc.o:(.bss+0x0): multiple definition of `ml_table_extension_events'; ml_gdkpixbuf.o:(.bss+0x0): first defined here
/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ml_gtkpack.o:(.bss+0x0): multiple definition of `ml_table_extension_events'; ml_gdkpixbuf.o:(.bss+0x0): first defined here
/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ml_gtkrange.o:(.bss+0x0): multiple definition of `ml_table_extension_events'; ml_gdkpixbuf.o:(.bss+0x0): first defined here
/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ml_gtkstock.o:(.bss+0x0): multiple definition of `ml_table_extension_events'; ml_gdkpixbuf.o:(.bss+0x0): first defined here
/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ml_gtktext.o:(.bss+0x0): multiple definition of `ml_table_extension_events'; ml_gdkpixbuf.o:(.bss+0x0): first defined here
/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ml_gtktree.o:(.bss+0x0): multiple definition of `ml_table_extension_events'; ml_gdkpixbuf.o:(.bss+0x0): first defined here
7 jobs for !16117 with ocaml-lablgtk in 2 minutes and 24 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
passed #278654
docker-alpine x86_64
lint

00:00:17

 
  Build
failed #278659
docker-alpine ci-build aarch64
build-aarch64

00:01:31

passed #278660
docker-alpine ci-build armv7
build-armv7

00:00:33

failed #278658
docker-alpine ci-build ppc64le
build-ppc64le

00:01:44

passed #278657
docker-alpine ci-build s390x
build-s390x

00:01:02

passed #278656
docker-alpine ci-build x86
build-x86

00:00:21

failed #278655
docker-alpine ci-build x86_64
build-x86_64

00:01:03

 
Name Stage Failure
failed
build-x86_64 Build
No job log
failed
build-aarch64 Build
No job log
failed
build-ppc64le Build
No job log