yajl: pass the cmake variable LIB_SUFFIX to handle installation on 64-bit systems

WARNING: QA Issue: yajl: Files/directories were installed but not shipped
  /usr/lib
  /usr/lib/libyajl.so.2
  /usr/lib/libyajl.so
  /usr/lib/libyajl_s.a
  /usr/lib/libyajl.so.2.0.4
  /usr/lib/.debug
  /usr/lib/.debug/libyajl.so.2.0.4

NOTE: for 64-bit systems where lib64 is used you can pass the cmake
      variable LIB_SUFFIX to cause installation into the system's 'lib64'
      directory.

Signed-off-by: Olivia Yin <hong-hua.yin@freescale.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>