message: builds android-arm library
diff: import os ;
  ANDROID_TOOLCHAIN = [ os.environ ANDROID_TOOLCHAIN ] ;
  -android_api = [ os.environ android_api ] ;
  +ANDROID_API = [ os.environ android_api ] ;
  -using clang-linux : arm : $(ANDROID_TOOLCHAIN)/bin/armv7a-linux-androideabi$(android_api)-clang++
  +using clang-linux : arm : $(ANDROID_TOOLCHAIN)/bin/armv7a-linux-androideabi$(ANDROID_API)-clang++ :
  <cxxflags>-fPIC
  <cxxflags>-march=armv7-a
  <cxxflags>-mfpu=neon
  @@ -11,6 +11,7 @@ using clang-linux : arm : $(ANDROID_TOOLCHAIN)/bin/armv7a-linux-androideabi$(and
  <cxxflags>-DANDROID
  <cxxflags>-D__STDC_FORMAT_MACROS
  <cxxflags>-D_FILE_OFFSET_BITS=64
  + <cxxflags>-frtti
  <cxxflags>-fno-strict-aliasing
  <cxxflags>-fvisibility=hidden
  <linkflags>-static-libstdc++
  