Remove all android references from SCons file

SConstruct

Index: SConstruct
diff --git a/SConstruct b/SConstruct
index 305675894bbb8ddca4d11a55095f371b3b71feb2..82b83ceafa0c0dfd87dff352b5cda7ea63151dbc 100644
--- a/SConstruct
+++ b/SConstruct
@@ -101,17 +101,10 @@ LIBRARY_FLAGS = {
     'mode:debug': {
       'CCFLAGS':      ['-g', '-O0'],
       'CPPDEFINES':   ['ENABLE_DISASSEMBLER', 'DEBUG'],
-      'os:android': {
-        'CCFLAGS':    ['-mthumb']
-      }
     },
     'mode:release': {
       'CCFLAGS':      ['-O3', '-fomit-frame-pointer', '-fdata-sections',
                        '-ffunction-sections'],
-      'os:android': {
-        'CCFLAGS':    ['-mthumb', '-Os'],
-        'CPPDEFINES': ['SK_RELEASE', 'NDEBUG']
-      }
     },
     'os:linux': {
       'CCFLAGS':      ['-ansi'] + GCC_EXTRA_CCFLAGS,
@@ -779,7 +772,7 @@ PLATFORM_OPTIONS = {
     'help': 'the architecture to build for'
   },
   'os': {
-    'values': ['freebsd', 'linux', 'macos', 'win32', 'android', 'openbsd', 'solaris', 'cygwin'],
+    'values': ['freebsd', 'linux', 'macos', 'win32', 'openbsd', 'solaris', 'cygwin'],
     'guess': GuessOS,
     'help': 'the os to build for'
   },