depends: add shared dependency builder

See the README's in depends for documentation

depends/patches/qt/fix-xcb-include-order.patch

@@ -0,0 +1,21 @@
+--- old/qtbase/src/plugins/platforms/xcb/xcb-plugin.pro	2014-07-30 18:17:27.384458441 -0400
++++ new/qtbase/src/plugins/platforms/xcb/xcb-plugin.pro	2014-07-30 18:18:28.620459303 -0400
+@@ -101,10 +101,6 @@
+     }
+ }
+ 
+-DEFINES += $$QMAKE_DEFINES_XCB
+-LIBS += $$QMAKE_LIBS_XCB
+-QMAKE_CXXFLAGS += $$QMAKE_CFLAGS_XCB
+-
+ CONFIG += qpa/genericunixfontdatabase
+ 
+ contains(QT_CONFIG, dbus) {
+@@ -141,3 +137,7 @@
+         INCLUDEPATH += ../../../3rdparty/xkbcommon/xkbcommon/
+     }
+ }
++
++DEFINES += $$QMAKE_DEFINES_XCB
++LIBS += $$QMAKE_LIBS_XCB
++INCLUDEPATH += $$QMAKE_CFLAGS_XCB

depends/patches/qt/mac-qmake.conf

@@ -0,0 +1,23 @@
+MAKEFILE_GENERATOR = UNIX
+CONFIG += app_bundle incremental global_init_link_order lib_version_first plugin_no_soname absolute_library_soname
+QMAKE_INCREMENTAL_STYLE = sublib
+include(../common/macx.conf)
+include(../common/gcc-base-mac.conf)
+include(../common/clang.conf)
+include(../common/clang-mac.conf)
+QMAKE_MAC_SDK_PATH=$${MAC_SDK_PATH}
+QMAKE_XCODE_VERSION=4.3
+QMAKE_XCODE_DEVELOPER_PATH=/Developer
+QMAKE_MACOSX_DEPLOYMENT_TARGET = $${MAC_MIN_VERSION}
+QMAKE_MAC_SDK=macosx
+QMAKE_MAC_SDK.macosx.path = $$QMAKE_MAC_SDK_PATH
+QMAKE_MAC_SDK.macosx.platform_name = macosx
+QMAKE_CFLAGS += -target $${MAC_TARGET}
+QMAKE_OBJECTIVE_CFLAGS += $$QMAKE_CFLAGS
+QMAKE_CXXFLAGS += $$QMAKE_CFLAGS
+QMAKE_LFLAGS += -target $${MAC_TARGET}
+QMAKE_AR = $${CROSS_COMPILE}ar cq
+QMAKE_RANLIB=$${CROSS_COMPILE}ranlib
+QMAKE_LIBTOOL=$${CROSS_COMPILE}libtool
+QMAKE_INSTALL_NAME_TOOL=$${CROSS_COMPILE}install_name_tool
+load(qt_config)