[android] Add missing POSIX/Linux headers to Android build.

Reviewed the cases of Glibc where branching occurred and checked the
skipped headers against the Android NDK sysroot, and added the Android
check in the right places. This will give access to a lot more
functions from libc.

Author: drodriguez

stdlib/public/Platform/glibc.modulemap.gyb

@@ -47,13 +47,13 @@ module SwiftGlibc [system] {
       export *
     }
 % end
-% if CMAKE_SDK in ["LINUX", "FREEBSD", "CYGWIN", "HAIKU"]:
+% if CMAKE_SDK in ["LINUX", "FREEBSD", "CYGWIN", "HAIKU", "ANDROID"]:
     module complex {
       header "${GLIBC_INCLUDE_PATH}/complex.h"
       export *
     }
 % end
-% if CMAKE_SDK in ["LINUX", "CYGWIN"]:
+% if CMAKE_SDK in ["LINUX", "CYGWIN", "ANDROID"]:
     module pty {
       header "${GLIBC_INCLUDE_PATH}/pty.h"
       export *
@@ -181,7 +181,7 @@ module SwiftGlibc [system] {
 
   // POSIX
   module POSIX {
-% if CMAKE_SDK in ["LINUX", "CYGWIN"]:
+% if CMAKE_SDK in ["LINUX", "CYGWIN", "ANDROID"]:
     module wait {
       header "${GLIBC_INCLUDE_PATH}/wait.h"
       export *
@@ -210,8 +210,18 @@ module SwiftGlibc [system] {
       export *
     }
 % end
+% if CMAKE_SDK == "ANDROID":
+    module cpio {
+      header "${GLIBC_INCLUDE_PATH}/cpio.h"
+      export *
+    }
+    module nl_types {
+      header "${GLIBC_INCLUDE_PATH}/nl_types.h"
+      export *
+    }
+% end
 
-% if CMAKE_SDK in ["LINUX", "FREEBSD", "CYGWIN"]:
+% if CMAKE_SDK in ["LINUX", "FREEBSD", "CYGWIN", "ANDROID"]:
     module ftw {
       header "${GLIBC_INCLUDE_PATH}/ftw.h"
       export *
@@ -228,10 +238,12 @@ module SwiftGlibc [system] {
       header "${GLIBC_INCLUDE_PATH}/langinfo.h"
       export *
     }
+% if CMAKE_SDK != "ANDROID":
     module monetary {
       header "${GLIBC_INCLUDE_PATH}/monetary.h"
       export *
     }
+% end
     module netdb {
       header "${GLIBC_INCLUDE_PATH}/netdb.h"
       export *
@@ -256,6 +268,7 @@ module SwiftGlibc [system] {
       header "${GLIBC_INCLUDE_PATH}/tar.h"
       export *
     }
+% if CMAKE_SDK != "ANDROID":
     module utmpx {
       header "${GLIBC_INCLUDE_PATH}/utmpx.h"
       export *
@@ -265,6 +278,7 @@ module SwiftGlibc [system] {
       export *
     }
 % end
+% end
 
 % if CMAKE_SDK == "HAIKU":
     module ftw {
@@ -393,7 +407,7 @@ module SwiftGlibc [system] {
     module sys {
       export *
 
-% if CMAKE_SDK in ["LINUX", "FREEBSD", "CYGWIN", "HAIKU"]:
+% if CMAKE_SDK in ["LINUX", "FREEBSD", "CYGWIN", "HAIKU", "ANDROID"]:
       module file {
         header "${GLIBC_ARCH_INCLUDE_PATH}/sys/file.h"
         export *
@@ -478,7 +492,7 @@ module SwiftGlibc [system] {
         header "${GLIBC_ARCH_INCLUDE_PATH}/sys/un.h"
         export *
       }
-% if CMAKE_SDK in ["LINUX"]:
+% if CMAKE_SDK in ["LINUX", "ANDROID"]:
       module user {
         header "${GLIBC_ARCH_INCLUDE_PATH}/sys/user.h"
         export *
@@ -493,7 +507,7 @@ module SwiftGlibc [system] {
         export *
       }
     }
-% if CMAKE_SDK in ["LINUX", "FREEBSD"]:
+% if CMAKE_SDK in ["LINUX", "FREEBSD", "ANDROID"]:
     module sysexits {
       header "${GLIBC_INCLUDE_PATH}/sysexits.h"
       export *