Remove obsolete prebuilts.

Bug: https://github.com/android/ndk/issues/1142
Change-Id: I8adf0578a0af9295f9bb3e3d491d679b510a761d

current/platform/mips/libRSSupport.so

diff --git a/current/platform/mips/libRSSupport.so b/current/platform/mips/libRSSupport.so
deleted file mode 100755
index 0818965..0000000
--- a/current/platform/mips/libRSSupport.so
+++ /dev/null
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current/platform/mips/libRSSupportIO.so

diff --git a/current/platform/mips/libRSSupportIO.so b/current/platform/mips/libRSSupportIO.so
deleted file mode 100755
index eda75df..0000000
--- a/current/platform/mips/libRSSupportIO.so
+++ /dev/null
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current/platform/mips/libRScpp_static.a

diff --git a/current/platform/mips/libRScpp_static.a b/current/platform/mips/libRScpp_static.a
deleted file mode 100644
index 544375f..0000000
--- a/current/platform/mips/libRScpp_static.a
+++ /dev/null
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current/platform/mips/libblasV8.so

diff --git a/current/platform/mips/libblasV8.so b/current/platform/mips/libblasV8.so
deleted file mode 100755
index 058c5cf..0000000
--- a/current/platform/mips/libblasV8.so
+++ /dev/null
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current/platform/mips/libcompiler_rt.a

diff --git a/current/platform/mips/libcompiler_rt.a b/current/platform/mips/libcompiler_rt.a
deleted file mode 100644
index 45980e5..0000000
--- a/current/platform/mips/libcompiler_rt.a
+++ /dev/null
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current/platform/mips/librsrt.bc

diff --git a/current/platform/mips/librsrt.bc b/current/platform/mips/librsrt.bc
deleted file mode 100644
index ee0429a..0000000
--- a/current/platform/mips/librsrt.bc
+++ /dev/null
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