Remove GYP build support (issue #1403)

patch/patches/build.patch

@@ -1,26 +0,0 @@
-diff --git common.gypi common.gypi
-index 0935433..670db78 100644
---- common.gypi
-+++ common.gypi
-@@ -9,6 +9,9 @@
-   # Variables expected to be overriden on the GYP command line (-D) or by
-   # ~/.gyp/include.gypi.
-   'variables': {
-+    # Directory for CEF source files. This will be set by cef.gypi.
-+    'cef_directory%' : '',
-+
-     # Putting a variables dict inside another variables dict looks kind of
-     # weird.  This is done so that 'host_arch', 'chromeos', etc are defined as
-     # variables within the outer variables dict here.  This is necessary
-@@ -90,7 +93,10 @@
-           # depending on the packages installed on the local machine. Set this
-           # to 0 to build against locally installed headers and libraries (e.g.
-           # if packaging for a linux distro)
--          'use_sysroot%': 1,
-+          # Disable use of the sysroot image for CEF because it does not include
-+          # the GTK dependency required by cefclient. It would be nice to enable
-+          # this functionality in the future. See http://crbug.com/504446.
-+          'use_sysroot%': 0,
- 
-           # Override buildtype to select the desired build flavor.
-           # Dev - everyday build for development/testing