Adds targets for simarmv6 and armv6

tools/gyp/configurations_make.gypi

Index: tools/gyp/configurations_make.gypi
diff --git a/tools/gyp/configurations_make.gypi b/tools/gyp/configurations_make.gypi
index ebaf9359f01ff56dc60bbcfb881ae414218a1c25..307b1c2b68cd6f3682cb876cae73b3ae99074930 100644
--- a/tools/gyp/configurations_make.gypi
+++ b/tools/gyp/configurations_make.gypi
@@ -76,6 +76,12 @@
         'ldflags': [ '-m32', ],
       },
 
+      'Dart_Linux_simarmv6_Base': {
+        'abstract': 1,
+        'cflags': [ '-O3', '-m32', '-msse2', '-mfpmath=sse' ],
+        'ldflags': [ '-m32', ],
+      },
+
       'Dart_Linux_simarmv5te_Base': {
         'abstract': 1,
         'cflags': [ '-O3', '-m32', '-msse2', '-mfpmath=sse' ],
@@ -117,6 +123,35 @@
         ],
       },
 
+      # ARMv6 cross-build
+      'Dart_Linux_xarmv6_Base': {
+        'abstract': 1,
+        'target_conditions': [
+        ['_toolset=="target"', {
+          'cflags': [
+            '-march=armv6',
+            '-mfpu=vfp',
+            '-Wno-psabi', # suppresses va_list warning
+            '-fno-strict-overflow',
+          ],
+        }],
+        ['_toolset=="host"', {
+          'cflags': ['-m32', '-msse2', '-mfpmath=sse' ],
+          'ldflags': ['-m32'],
+        }]]
+      },
+
+      # ARMv6 native build
+      'Dart_Linux_armv6_Base': {
+        'abstract': 1,
+        'cflags': [
+          '-march=armv6',
+          '-mfpu=vfp',
+          '-Wno-psabi', # suppresses va_list warning
+          '-fno-strict-overflow',
+        ],
+      },
+
       # ARMv5 cross-build
       'Dart_Linux_xarmv5te_Base': {
         'abstract': 1,