sstate-cache-management: skip populate_lic archives when removing duplicates

sstate-cache-management: skip populate_lic archives when removing duplicates

* there are 2 issues

* all *gcc* recipes produce "duplicate" files and we cannot keep just the newest one:
  OE qemux86@ ~/build/oe-core $ find sstate-cache/ | grep gcc.*populate_lic
  sstate-cache/cd/sstate:gcc::4.8.2:r0::3:cd8d1a33b832662b624f5e4bd9f55154_populate_lic.tgz
  sstate-cache/cd/sstate:gcc::4.8.2:r0::3:cd8d1a33b832662b624f5e4bd9f55154_populate_lic.tgz.siginfo
  sstate-cache/d5/sstate:gcc::4.8.2:r0::3:d591af812395cc386e017fa2c8fa0722_populate_lic.tgz
  sstate-cache/d5/sstate:gcc::4.8.2:r0::3:d591af812395cc386e017fa2c8fa0722_populate_lic.tgz.siginfo
  sstate-cache/f7/sstate:gcc::4.8.2:r0::3:f74cfd4982fd7c349a5418f07297f955_populate_lic.tgz
  sstate-cache/f7/sstate:gcc::4.8.2:r0::3:f74cfd4982fd7c349a5418f07297f955_populate_lic.tgz.siginfo
  sstate-cache/74/sstate:gcc::4.8.2:r0::3:7489e4502cb446506b9829cda13c7630_populate_lic.tgz
  sstate-cache/74/sstate:gcc::4.8.2:r0::3:7489e4502cb446506b9829cda13c7630_populate_lic.tgz.siginfo

  OE qemux86@ ~/build/oe-core $ find tmp-eglibc/stamps/ | grep gcc.*populate_lic
  tmp-eglibc/stamps/i586-oe-linux/gcc-cross-initial/4.8.2-r0.do_populate_lic_setscene.cd8d1a33b832662b624f5e4bd9f55154
  tmp-eglibc/stamps/i586-oe-linux/libgcc/4.8.2-r0.do_populate_lic_setscene.f74cfd4982fd7c349a5418f07297f955
  tmp-eglibc/stamps/i586-oe-linux/gcc-cross/4.8.2-r0.do_populate_lic_setscene.d591af812395cc386e017fa2c8fa0722
  tmp-eglibc/stamps/i586-oe-linux/gcc-runtime/4.8.2-r0.do_populate_lic_setscene.7489e4502cb446506b9829cda13c7630

* the same for target and native versions of the same recipe:
  OE qemux86@ ~/build/oe-core $ find tmp-eglibc/stamps/ | grep opkg-utils.*populate_lic
  tmp-eglibc/stamps/x86_64-linux/opkg-utils-native/0.1.8+gitAUTOINC+c33b217016-r0.do_populate_lic_setscene.dd21a3c5444482ce90be4c9a33d806f1
  tmp-eglibc/stamps/i586-oe-linux/opkg-utils/0.1.8+gitAUTOINC+c33b217016-r0.do_populate_lic_setscene.8571422f9e311dc41bb6b21e71a09bc0

  OE qemux86@ ~/build/oe-core $ find sstate-cache/ | grep opkg-utils.*populate_lic
  sstate-cache/dd/sstate:opkg-utils::0.1.8+gitAUTOINC+c33b217016:r0::3:dd21a3c5444482ce90be4c9a33d806f1_populate_lic.tgz.siginfo
  sstate-cache/dd/sstate:opkg-utils::0.1.8+gitAUTOINC+c33b217016:r0::3:dd21a3c5444482ce90be4c9a33d806f1_populate_lic.tgz
  sstate-cache/85/sstate:opkg-utils::0.1.8+gitAUTOINC+c33b217016:r0::3:8571422f9e311dc41bb6b21e71a09bc0_populate_lic.tgz.siginfo
  sstate-cache/85/sstate:opkg-utils::0.1.8+gitAUTOINC+c33b217016:r0::3:8571422f9e311dc41bb6b21e71a09bc0_populate_lic.tgz

* similar problem for .siginfo file of do_patch:
  OE qemux86@ ~/build/oe-core $ find sstate-cache/ | grep eglibc.*patch
  sstate-cache/99/sstate:eglibc::2.19:r0::3:99b7e1d688e4c6c659b458c9c57611df_patch.tgz.siginfo
  sstate-cache/11/sstate:eglibc::2.19:r0::3:11401ddd208a753fee17696b14dc1e52_patch.tgz.siginfo

  OE qemux86@ ~/build/oe-core $ find tmp-eglibc/stamps/  | grep /eglibc.*patch
  tmp-eglibc/stamps/i586-oe-linux/eglibc-initial/2.19-r0.do_patch.sigdata.99b7e1d688e4c6c659b458c9c57611df
  tmp-eglibc/stamps/i586-oe-linux/eglibc/2.19-r0.do_patch.sigdata.11401ddd208a753fee17696b14dc1e52

* maybe these should have ideally identical signatures, but before it's fixed lets
  just skip removing them

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>