Configure standalone bcc compiler to work with plugin libraries.

Bug: 7342767

This change adds support (hidden behind the EXTERNAL_BCC_COMPILER ifdef)
for loading plugin libraries via the external bcc toolchain. The external
bcc compiler loads the named library and will then invoke a customized
rsCompilerDriverInit() from that library.

Change-Id: I07c2ea68be54c2255d36926fd37e395db790ef8f
6 files changed