Utilities/Release: Switch to Qt 5.7 for Linux x86_64 binary

Compile as C++11 since Qt 5.7 requires it.  Limit use of glibc
to 2.6 APIs and lower.

Utilities/Release/linux64_release.cmake

@@ -2,12 +2,28 @@ set(PROCESSORS 4)
 set(BOOTSTRAP_ARGS "--docdir=doc/cmake")
 set(HOST linux64)
 set(MAKE_PROGRAM "make")
-set(CC /opt/gcc-4.9.2/bin/gcc)
+set(CC /opt/gcc-6.1.0/bin/gcc)
-set(CXX /opt/gcc-4.9.2/bin/g++)
+set(CXX /opt/gcc-6.1.0/bin/g++)
 set(CFLAGS   "")
 set(CXXFLAGS "")
+set(qt_prefix "/home/kitware/qt-5.7.0")
+set(qt_xcb_libs
+  ${qt_prefix}/plugins/platforms/libqxcb.a
+  ${qt_prefix}/lib/libQt5XcbQpa.a
+  ${qt_prefix}/lib/libQt5PlatformSupport.a
+  ${qt_prefix}/lib/libxcb-static.a
+  -lX11-xcb
+  -lX11
+  -lxcb
+  -lfontconfig
+  -lfreetype
+  )
 set(INITIAL_CACHE "
 CMAKE_BUILD_TYPE:STRING=Release
+CMAKE_C_STANDARD:STRING=11
+CMAKE_CXX_STANDARD:STRING=11
+CMAKE_C_FLAGS:STRING=-D_POSIX_C_SOURCE=199506L -D_POSIX_SOURCE=1 -D_SVID_SOURCE=1 -D_BSD_SOURCE=1
+CMAKE_EXE_LINKER_FLAGS:STRING=-static-libstdc++ -static-libgcc
 CURSES_LIBRARY:FILEPATH=/home/kitware/ncurses-5.9/lib/libncurses.a
 CURSES_INCLUDE_PATH:PATH=/home/kitware/ncurses-5.9/include
 FORM_LIBRARY:FILEPATH=/home/kitware/ncurses-5.9/lib/libform.a
@@ -17,9 +33,14 @@ OPENSSL_INCLUDE_DIR:PATH=/home/kitware/openssl-1.0.2h/include
 OPENSSL_SSL_LIBRARY:FILEPATH=/home/kitware/openssl-1.0.2h/lib/libssl.a
 CPACK_SYSTEM_NAME:STRING=Linux-x86_64
 BUILD_QtDialog:BOOL:=TRUE
-CMake_GUI_DISTRIBUTE_WITH_Qt_LGPL:STRING=2.1
+CMake_GUI_DISTRIBUTE_WITH_Qt_LGPL:STRING=3
 CMake_INSTALL_DEPENDENCIES:BOOL=ON
-QT_QMAKE_EXECUTABLE:FILEPATH=/home/kitware/qt-4.8.6/bin/qmake
+CMAKE_PREFIX_PATH:STRING=${qt_prefix}
+CMake_QT_STATIC_QXcbIntegrationPlugin_LIBRARIES:STRING=${qt_xcb_libs}
 ")
+
+# Exclude Qt5 tests because our Qt5 is static.
+set(EXTRA_CTEST_ARGS "-E Qt5")
+
 get_filename_component(path "${CMAKE_CURRENT_LIST_FILE}" PATH)
 include(${path}/release_cmake.cmake)