Tweak linux_glibc properties for musl builds in system/core

For convenience, builds against musl libc currently use the
linux_glibc properties because they are almost always linux-specific
and not glibc-specific.  In preparation for removing this hack,
tweak the linux_glibc properties by either moving them to host_linux,
which will apply to linux_glibc, linux_musl and linux_bionic, or
by setting appropriate musl or linux_musl properties.  Properties
that must not be repeated while musl uses linux_musl and also still
uses the linux_glibc properties are moved to glibc properties, which
don't apply to musl.  Whether these stay as glibc properties or get
moved back to linux_glibc later once the musl hack is removed is TBD.

Bug: 223257095
Test: m checkbuild
Test: m USE_HOST_MUSL=true host-native
Change-Id: I076fa026d7dddfccfa5cc395dd06bdc979eee1d8
diff --git a/libutils/Android.bp b/libutils/Android.bp
index 58af8e4..a9bd7d9 100644
--- a/libutils/Android.bp
+++ b/libutils/Android.bp
@@ -48,13 +48,11 @@
             header_libs: ["libbacktrace_headers"],
             export_header_lib_headers: ["libbacktrace_headers"],
         },
-        linux_glibc: {
+        host_linux: {
             header_libs: ["libbacktrace_headers"],
             export_header_lib_headers: ["libbacktrace_headers"],
         },
         linux_bionic: {
-            header_libs: ["libbacktrace_headers"],
-            export_header_lib_headers: ["libbacktrace_headers"],
             enabled: true,
         },
         windows: {