Rename test .c sources to .cpp where necessary (#604)

Remove hacks to force language from CMake files.

Closes KhronosGroup/OpenCL-CTS#25

test_conformance/math_brute_force/CMakeLists.txt

@@ -1,43 +1,43 @@
 set(MODULE_NAME BRUTEFORCE)
 
 set(${MODULE_NAME}_SOURCES
-    FunctionList.c
-    Sleep.c
-    binary.c
-    binaryOperator.c
-    Utility.c
-    binary_i.c
-    binary_two_results_i.c
-    i_unary.c
-    macro_binary.c
-    macro_unary.c
-    mad.c
-    main.c
-    reference_math.c
-    ternary.c
-    unary.c
-    unary_two_results.c
-    unary_two_results_i.c
-    unary_u.c
+    FunctionList.cpp
+    Sleep.cpp
+    binary.cpp
+    binaryOperator.cpp
+    Utility.cpp
+    binary_i.cpp
+    binary_two_results_i.cpp
+    i_unary.cpp
+    macro_binary.cpp
+    macro_unary.cpp
+    mad.cpp
+    main.cpp
+    reference_math.cpp
+    ternary.cpp
+    unary.cpp
+    unary_two_results.cpp
+    unary_two_results_i.cpp
+    unary_u.cpp
 )
 
 
 if (NOT ANDROID)
 set_source_files_properties(
-    FunctionList.c
-    Sleep.c
-    binary.c
-    binaryOperator.c
-    Utility.c
-    binary_i.c
-    binary_two_results_i.c
-    i_unary.c
-    macro_binary.c
-    macro_unary.c
-    mad.c
-    main.c     reference_math.c
-    ternary.c     unary.c     unary_two_results.c
-    unary_two_results_i.c unary_u.c
+    FunctionList.cpp
+    Sleep.cpp
+    binary.cpp
+    binaryOperator.cpp
+    Utility.cpp
+    binary_i.cpp
+    binary_two_results_i.cpp
+    i_unary.cpp
+    macro_binary.cpp
+    macro_unary.cpp
+    mad.cpp
+    main.cpp     reference_math.cpp
+    ternary.cpp     unary.cpp     unary_two_results.cpp
+    unary_two_results_i.cpp unary_u.cpp
     COMPILE_FLAGS -msse2    )
 endif(NOT ANDROID)