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Don't use -Wdouble-promotion gcc option

The warning flag isn't recognized for older GCC versions (blackfin),
so just disable it.

Signed-off-by: Gustavo Zacarias <gustavo.zacarias@free-electrons.com>
[Gustavo: update for 1.3.5]
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
[Bernd: update for 1.3.10]

diff -Nura graphite2-1.3.5.orig/src/CMakeLists.txt graphite2-1.3.5/src/CMakeLists.txt
--- graphite2-1.3.5.orig/src/CMakeLists.txt	2016-02-15 11:46:45.941906112 -0300
+++ graphite2-1.3.5/src/CMakeLists.txt	2016-02-15 11:46:54.237194222 -0300
@@ -111,9 +111,6 @@
     if (${CMAKE_SYSTEM_PROCESSOR} MATCHES "x86|i.86")
         add_definitions(-mfpmath=sse -msse2)
     endif (${CMAKE_SYSTEM_PROCESSOR} MATCHES "x86|i.86")
-    if (CMAKE_COMPILER_IS_GNUCXX)
-        add_definitions(-Wdouble-promotion)
-    endif (CMAKE_COMPILER_IS_GNUCXX)
     message(STATUS "Compiler ID is: ${CMAKE_CXX_COMPILER_ID}")
     if (${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang")
         add_definitions(-Wimplicit-fallthrough)
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