Build issue since version 4.18 using gcc-4.9

[Vincent Fortier]

While preparing a gnutls update I ended-up updating libtasn1 from
4.16.  Going to 4.17 works but anything after that fails with:

  CC       explicit_bzero.lo
explicit_bzero.c: In function 'explicit_bzero':
explicit_bzero.c:60:3: error: 'asm' undeclared (first use in this function)
   asm volatile ("" ::: "memory");
   ^
explicit_bzero.c:60:3: note: each undeclared identifier is reported
only once for each function it appears in
explicit_bzero.c:60:7: error: expected ';' before 'volatile'
   asm volatile ("" ::: "memory");
       ^
make[8]: *** [Makefile:1664: explicit_bzero.lo] Error 1
make[8]: *** Waiting for unfinished jobs....
make[8]: Leaving directory
'/home/spksrc/gnutls-update/spksrc/cross/libtasn1/work-x64-6.1/libtasn1-4.18.0/src/gl'
make[7]: *** [Makefile:1683: all-recursive] Error 1
make[7]: Leaving directory
'/home/spksrc/gnutls-update/spksrc/cross/libtasn1/work-x64-6.1/libtasn1-4.18.0/src/gl'
make[6]: *** [Makefile:1555: all] Error 2
make[6]: Leaving directory
'/home/spksrc/gnutls-update/spksrc/cross/libtasn1/work-x64-6.1/libtasn1-4.18.0/src/gl'
make[5]: *** [Makefile:1615: all-recursive] Error 1
make[5]: Leaving directory
'/home/spksrc/gnutls-update/spksrc/cross/libtasn1/work-x64-6.1/libtasn1-4.18.0/src'
make[4]: *** [Makefile:1550: all-recursive] Error 1
make[4]: Leaving directory
'/home/spksrc/gnutls-update/spksrc/cross/libtasn1/work-x64-6.1/libtasn1-4.18.0'
make[3]: *** [Makefile:1479: all] Error 2
make[3]: Leaving directory
'/home/spksrc/gnutls-update/spksrc/cross/libtasn1/work-x64-6.1/libtasn1-4.18.0'
make[2]: *** [../../mk/spksrc.compile.mk:46: compile_target] Error 2
make[2]: Leaving directory '/home/spksrc/gnutls-update/spksrc/cross/libtasn1'
make[1]: *** [../../mk/spksrc.cross-cc.mk:111: build-arch-x64-6.1] Error 1
make[1]: Leaving directory '/home/spksrc/gnutls-update/spksrc/cross/libtasn1'
make: *** [../../mk/spksrc.cross-cc.mk:106: arch-x64-6.1] Error

Current PR : https://github.com/SynoCommunity/spksrc/pull/5497

Thnx in advance for the help.

- vin

build-x64-6.1.log
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