Use __RENAME for long double functions.

We can cut a lot of stuff out of the NDK's libandroid_support with this,
and reduce unnecessary relocations for all LP32 code. LP64 code should
be unaffected.

Bug: https://issuetracker.google.com/64450768
Bug: https://github.com/android-ndk/ndk/issues/507
Test: ran tests, plus manual readelf on the _test.o files
Change-Id: I3de6015921195304ea9c829ef31665cd34664066
diff --git a/tests/complex_force_long_double_test.cpp b/tests/complex_force_long_double_test.cpp
new file mode 100644
index 0000000..2ea7bd4
--- /dev/null
+++ b/tests/complex_force_long_double_test.cpp
@@ -0,0 +1,2 @@
+#define __BIONIC_LP32_USE_LONG_DOUBLE
+#include "complex_test.cpp"