feat: add linkopts property

[birunts]

Strict modules now have linkopts property to provide additional linker options. For Linux all options are placed at the end of linker command. For Android
linker options are transitioned to module's
ldflags property.

Change-Id: Ie5daecc23f52671942210cbf37c6484add8a730c

[github-actions]

LCOV of commit b057e09 during CI #519

Summary coverage rate:
  lines......: 34.8% (4588 of 13191 lines)
  functions..: no data found
  branches...: 62.0% (556 of 897 branches)

Files changed coverage rate:
                                                 |Lines       |Functions  |Branches    
  Filename                                       |Rate     Num|Rate    Num|Rate     Num
  =====================================================================================
  core/androidbp_cclibs.go                       | 3.0%    607|    -     0|    -      0
  core/flag/flag.go                              |75.7%     70|    -     0|    -      0
  core/linux_cclibs.go                           | 0.6%    498|    -     0|    -      0
  core/strict_binary.go                          | 0.0%     44|    -     0|    -      0
  core/strict_library.go                         | 0.0%    257|    -     0|    -      0