Build Skia as a static library

- Roll GYP so that we get non-thin archives on Linux
- Add merge_static_libs.py
- Add skia_core_lib target which builds core, ports, opts*, and utils
- Replace dependencies on core/ports/opts/utils with skia_core_libs
- Rename exportable libraries with "skia_"
Review URL: https://codereview.appspot.com/6619049

git-svn-id: http://skia.googlecode.com/svn/trunk@5889 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/Makefile b/Makefile
index 4de8bc6..aa14410 100644
--- a/Makefile
+++ b/Makefile
@@ -29,7 +29,12 @@
 
 BUILDTYPE ?= Debug
 CWD := $(shell pwd)
-ALL_TARGETS := core SampleApp bench gm tests tools
+ALL_TARGETS := skia_base_libs \
+               bench \
+               gm \
+               SampleApp \
+               tests \
+               tools
 
 ifneq (,$(findstring skia_os=android, $(GYP_DEFINES)))
 ifeq (,$(findstring android_make_apk=0, $(GYP_DEFINES)))