package/quickjs: needs host gcc >= 4.9 (C11/stdatomic.h)

package/quickjs: needs host gcc >= 4.9 (C11/stdatomic.h)

Fixes:

  - http://autobuild.buildroot.net/results/c7882cc2d66984350f54d619f39cfee5065d941a

  gcc -g -Wall -MMD -MF .obj/libregexp.host.o.d -Wno-array-bounds -Wno-format-truncation -D_GNU_SOURCE -DCONFIG_VERSION=\"2020-11-08\" -DCONFIG_BIGNUM -O2 -flto -c -o .obj/libregexp.host.o libregexp.c
  quickjs.c:112:23: fatal error: stdatomic.h: No such file or directory
   #include <stdatomic.h>
                         ^
  compilation terminated.

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>