* remove Findtcmalloc.cmake, use Findgperftools.cmake instead.
* tcmalloc is packaged in gperftools-dev, so we can check them in a single
place.
* fix the check of heap-profiler.h, we should enable the check as long
as tcmalloc is enabled or profiler is enabled.
* only check gperftools headers in "include/gperftools", and do not
"include/google" anymore. as we only support the distros which
shipping recent gperftools-dev package with "include/gperftools".
and "google/*.h" are deprecated.
* set ALLOC_LIBS with GPERFTOOLS_TCMALLOC_LIBRARY, so we can link
against tcmalloc with full path.
Signed-off-by: Kefu Chai <kchai@redhat.com>
