simpleperf: don't statically link libc++ on darwin.

Statically linking libc++ causes segfault when loading
libsimpleperf_report.dylib to python on darwin. So switch
to shared libc++ on darwin.

But for linux and windows host, we still need libc++_static to
avoid missing "libc++.so" error.

Bug: 216316914
Test: run scripts/test/test.py
Change-Id: I32d399a33678c4d97e3f04aa4a30db72e42da560
1 file changed