dart: update to 2.7.0

packages/dart/build.sh

@@ -1,7 +1,7 @@
 TERMUX_PKG_HOMEPAGE=https://www.dartlang.org/
 TERMUX_PKG_DESCRIPTION="Dart is a general-purpose programming language"
 TERMUX_PKG_LICENSE="BSD"
-TERMUX_PKG_VERSION=2.4.1
+TERMUX_PKG_VERSION=2.7.0
 TERMUX_PKG_BUILD_IN_SRC=true
 
 # Dart uses tar and gzip to extract downloaded packages.

packages/dart/fix-shell-path.patch

@@ -19,27 +19,3 @@ diff -uNr src/sdk/pkg/front_end/lib/src/api_prototype/terminal_color_support.dar
  
    if (result.exitCode != 0) {
      if (debug) {
-diff -uNr src/sdk/pkg/front_end/lib/src/fasta/colors.dart src.mod/sdk/pkg/front_end/lib/src/fasta/colors.dart
---- src/sdk/pkg/front_end/lib/src/fasta/colors.dart	2019-05-22 18:59:58.267004322 +0000
-+++ src.mod/sdk/pkg/front_end/lib/src/fasta/colors.dart	2019-05-22 19:19:14.722850300 +0000
-@@ -154,7 +154,7 @@
-   // The `-S` option of `tput` allows us to query multiple capabilities at
-   // once.
-   ProcessResult result = Process.runSync(
--      "/bin/sh", ["-c", "printf '%s' '$TERMINAL_CAPABILITIES' | tput -S"]);
-+      "@TERMUX_PREFIX@/bin/sh", ["-c", "printf '%s' '$TERMINAL_CAPABILITIES' | tput -S"]);
- 
-   if (result.exitCode != 0) {
-     if (context.options.verbose) {
-diff -uNr src/sdk/runtime/bin/process_patch.dart src.mod/sdk/runtime/bin/process_patch.dart
---- src/sdk/runtime/bin/process_patch.dart	2019-05-22 18:59:58.641006510 +0000
-+++ src.mod/sdk/runtime/bin/process_patch.dart	2019-05-22 19:15:52.594173281 +0000
-@@ -321,7 +321,7 @@
-     if (Platform.isWindows) {
-       return 'cmd.exe';
-     }
--    return '/bin/sh';
-+    return '@TERMUX_PREFIX@/bin/sh';
-   }
- 
-   static List<String> _getShellArguments(