Fix linker warning on build with target_arch=ia32.

Fix linker warning on build with target_arch=ia32.

Since r257419, linker warning starts to cause the build failure.
This CL is fixing some linker warnings on cross compilation build so that build with target_arch=ia32 option works properly.
Here are the error logs:

/usr/bin/ld: skipping incompatible /lib/x86_64-linux-gnu/libgcrypt.so when searching for -lgcrypt
/usr/bin/ld: skipping incompatible /lib/x86_64-linux-gnu/libgcrypt.a when searching for -lgcrypt
/usr/bin/ld: skipping incompatible /lib/x86_64-linux-gnu/libcap.so when searching for -lcap
/usr/bin/ld: skipping incompatible /lib/x86_64-linux-gnu/libcap.a when searching for -lcap
/usr/bin/ld: warning: libgnutls.so.26, needed by /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../lib32/libcups.so, may conflict with libgnutls.so.28

BUG=n/a
TEST=build with GYP_DEFINES=target_arch=ia32, run trybot.

Review URL: https://codereview.chromium.org/202633008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@259463 0039d316-1c4b-4281-b951-d872f2087c98