Remove obsolete prebuilts.

Bug: https://github.com/android/ndk/issues/1142
Change-Id: I7b4fceb5462e578f5727ca9d3a32149f4666583c
diff --git a/current/platform/mips/libRSSupport.so b/current/platform/mips/libRSSupport.so
deleted file mode 100755
index fe1ab30..0000000
--- a/current/platform/mips/libRSSupport.so
+++ /dev/null
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diff --git a/current/platform/mips/libRSSupportIO.so b/current/platform/mips/libRSSupportIO.so
deleted file mode 100755
index 9be00ae..0000000
--- a/current/platform/mips/libRSSupportIO.so
+++ /dev/null
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diff --git a/current/platform/mips/libRScpp_static.a b/current/platform/mips/libRScpp_static.a
deleted file mode 100644
index c6a2c89..0000000
--- a/current/platform/mips/libRScpp_static.a
+++ /dev/null
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diff --git a/current/platform/mips/libblasV8.so b/current/platform/mips/libblasV8.so
deleted file mode 100755
index d92dfad..0000000
--- a/current/platform/mips/libblasV8.so
+++ /dev/null
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diff --git a/current/platform/mips/libcompiler_rt.a b/current/platform/mips/libcompiler_rt.a
deleted file mode 100644
index 007a1aa..0000000
--- a/current/platform/mips/libcompiler_rt.a
+++ /dev/null
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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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