Update escaping in Android.bp files

Strings like cflags in Android.bp files are parsed by blueprint,
written to build.ninja files, parsed by ninja, and then passed to
/bin/sh -c.  This had resulted in a combination of blueprint
(\"), ninja ($$), and shell (\$) escaping being necessary.

Soong has been updated to automatically handle ninja and shell
escaping, remove extra escaping from Android.bp files.

Bug: 31221587
Test: m -j
Change-Id: Ib58a51dee8d22296b69ec21768ba6a49dd60e980

libc/Android.bp

@@ -144,13 +144,13 @@ cc_library_static {
         // The name of the tm_gmtoff field in our struct tm.
         "-DTM_GMTOFF=tm_gmtoff",
         // Where we store our tzdata.
-        "-DTZDIR=\\\"/system/usr/share/zoneinfo\\\"",
+        "-DTZDIR=\"/system/usr/share/zoneinfo\"",
         // Include `tzname`, `timezone`, and `daylight` globals.
         "-DHAVE_POSIX_DECLS=0",
         "-DUSG_COMPAT=1",
         // Use the empty string (instead of "   ") as the timezone abbreviation
         // fallback.
-        "-DWILDABBR=\\\"\\\"",
+        "-DWILDABBR=\"\"",
         "-DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU",
         "-Dlint",
     ],

tests/Android.bp

@@ -361,7 +361,7 @@ cc_defaults {
                 "libutils",
             ],
             ldflags: [
-                "-Wl,--rpath,\\$${ORIGIN}/../bionic-loader-test-libs",
+                "-Wl,--rpath,${ORIGIN}/../bionic-loader-test-libs",
                 "-Wl,--enable-new-dtags",
             ],
         },