Fix ODR issue in viewcompiler

libz is already linked as a static library through
libdexfile_static_defaults, don't also link it as a shared library.
Fixes:
=================================================================
==43189==ERROR: AddressSanitizer: odr-violation (0x55d1ed723a60):
[1] size=48 'inflate_copyright' external/zlib/src/inftrees.c:11:12
[2] size=48 'inflate_copyright' external/zlib/src/inftrees.c:11:12
These globals were registered at these points:
[1]:
 #0 0x55d1ed769a0e (/buildbot/src/android/master/out/soong/host/linux-x86/bin/viewcompiler+0xf3a0e)
 #1 0x55d1ed991b1b (/buildbot/src/android/master/out/soong/host/linux-x86/bin/viewcompiler+0x31bb1b)

[2]:
 #0 0x55d1ed769a0e (/buildbot/src/android/master/out/soong/host/linux-x86/bin/viewcompiler+0xf3a0e)
 #1 0x7f5dff20a09b (/buildbot/src/android/master/out/soong/host/linux-x86/bin/../lib64/libz-host.so+0x3e09b)

Test: m SANITIZE_HOST=address viewcompiler && viewcompiler
Change-Id: I4ebdf7ef4ec1641488fbc25275dbf6aa0cdbe2eb