Merge changes from topic "linux_glibc"

* changes:
  Rename target.linux[_x86[_64]] to target.linux_glibc[_x86[_64]]
  Move host flags from linux -> host

base/Android.bp

@@ -89,7 +89,7 @@ cc_library {
             cppflags: ["-Wexit-time-destructors"],
             enabled: true,
         },
-        linux: {
+        linux_glibc: {
             srcs: [
                 "chrono_utils.cpp",
                 "errors_unix.cpp",
@@ -135,7 +135,7 @@ cc_test {
                 misc_undefined: ["integer"],
             },
         },
-        linux: {
+        linux_glibc: {
             srcs: ["chrono_utils_test.cpp"],
         },
         windows: {

libbacktrace/Android.bp

@@ -83,7 +83,7 @@ cc_library {
         darwin: {
             enabled: true,
         },
-        linux: {
+        linux_glibc: {
             srcs: libbacktrace_sources,
 
             shared_libs: [
@@ -135,7 +135,7 @@ cc_library_shared {
     srcs: ["backtrace_testlib.cpp"],
 
     target: {
-        linux: {
+        linux_glibc: {
             shared_libs: [
                 "libunwind",
                 "libunwindstack",
@@ -231,7 +231,7 @@ cc_test {
                 "libutils",
             ],
         },
-        linux: {
+        linux_glibc: {
             host_ldlibs: [
                 "-lncurses",
             ],

libdiskconfig/Android.bp

@@ -23,7 +23,7 @@ cc_library {
         darwin: {
             enabled: false,
         },
-        linux: {
+        linux_glibc: {
             cflags: [
                 "-O2",
                 "-g",

libunwindstack/Android.bp

@@ -67,7 +67,7 @@ cc_library {
 
     target: {
         // Always disable optimizations for host to make it easier to debug.
-        linux: {
+        host: {
             cflags: ["-O0", "-g"],
         },
     },

libutils/Android.bp

@@ -121,7 +121,7 @@ cc_library {
             },
         },
 
-        linux: {
+        linux_glibc: {
             srcs: [
                 "Looper.cpp",
                 "ProcessCallStack.cpp",

libutils/tests/Android.bp

@@ -46,7 +46,7 @@ cc_test {
                 "libbase",
             ],
         },
-        linux: {
+        linux_glibc: {
             srcs: [
                 "Looper_test.cpp",
                 "RefBase_test.cpp",