RemoveFromList() should remove all matches. Before this commit,
RemoveFromList() only removes the first match. This commit rewrites
RemoveFromList() so that it will remove all matches. Besides, a unit
test is written.
Note: aosp/461936 wants to make sure libc.so precedes libdl.so in
DT_NEEDED entries. However, if there are two "libdl" in shared_libs,
aosp/461936 won't achieve its goal because RemoveFromList() (prior to
this commit) only removes the first "libdl".
Bug: 62815515
Test: Build sailfish and check libstagefright.so
Change-Id: I9bec563cbf800bff4bd508fb21e28869a92cfe56
Move firstUniqueElements to android.FirstUniqueStrings,
lastUniqueElements to android.LastUniqueStrings, and lastUniquePaths
to android.LastUniquePaths.
Test: m checkbuild
Change-Id: Ieac840405126c7f8f98afb4a4ef35c01a18fe7fb