Sysroots: Remove a hack that adds gcc 4.6 to ld.so.conf

This CL removes a hack that adds /usr/lib/gcc/x86_64-linux-gnu/4.6 to
ld.so.conf.d/zz_hack.conf.  The only sysroots that exist currently are
Jessie and Trusty which both use gcc 4.8.

This caused the following flags to be passed to the linker:
-L/path/to/chromium/src/build/linux/debian_jessie_amd64-sysroot/usr/lib/gcc/x86_64-linux-gnu/4.6
-Wl,-rpath-link=/path/to/chromium/src/build/linux/debian_jessie_amd64-sysroot/usr/lib/gcc/x86_64-linux-gnu/4.6
While harmless, it is confusing and should be removed.

R=thestig@chromium.org

Review-Url: https://codereview.chromium.org/2863663003
Cr-Commit-Position: refs/heads/master@{#469518}

build/linux/sysroot_scripts/sysroot-creator.sh

@@ -293,11 +293,6 @@ HacksAndPatchesAmd64() {
   mkdir -p ${INSTALL_ROOT}/usr/lib/pkgconfig
   mv ${INSTALL_ROOT}/usr/lib/x86_64-linux-gnu/pkgconfig/* \
       ${INSTALL_ROOT}/usr/lib/pkgconfig
-
-  SubBanner "Adding an additional ld.conf include"
-  LD_SO_HACK_CONF="${INSTALL_ROOT}/etc/ld.so.conf.d/zz_hack.conf"
-  echo /usr/lib/gcc/x86_64-linux-gnu/4.6 > "$LD_SO_HACK_CONF"
-  echo /usr/lib >> "$LD_SO_HACK_CONF"
 }
 
 
@@ -318,11 +313,6 @@ HacksAndPatchesI386() {
   mkdir -p ${INSTALL_ROOT}/usr/lib/pkgconfig
   mv ${INSTALL_ROOT}/usr/lib/i386-linux-gnu/pkgconfig/* \
     ${INSTALL_ROOT}/usr/lib/pkgconfig
-
-  SubBanner "Adding an additional ld.conf include"
-  LD_SO_HACK_CONF="${INSTALL_ROOT}/etc/ld.so.conf.d/zz_hack.conf"
-  echo /usr/lib/gcc/i486-linux-gnu/4.6 > "$LD_SO_HACK_CONF"
-  echo /usr/lib >> "$LD_SO_HACK_CONF"
 }