Copy-pasted the wrong line from configure.in, fix gcc detection.

scripts/CMakeLists.txt

@@ -162,7 +162,7 @@ SET(CONFIGURE_LINE "Built using CMake")
 IF(CMAKE_COMPILER_IS_GNUCC)
   EXECUTE_PROCESS(
     COMMAND ${CMAKE_C_COMPILER} ${CMAKE_C_COMPILER_ARG1} --version
-    COMMAND grep -i version
+    COMMAND sed 1q
     OUTPUT_VARIABLE CC_VERSION)
 ELSE()
   SET(CC_VERSION "")
@@ -170,7 +170,7 @@ ENDIF()
 IF(CMAKE_COMPILER_IS_GNUCXX)
   EXECUTE_PROCESS(
     COMMAND ${CMAKE_CXX_COMPILER} ${CMAKE_CXX_COMPILER_ARG1} --version
-    COMMAND grep -i version
+    COMMAND sed 1q
     OUTPUT_VARIABLE CXX_VERSION)
 ELSE()
   SET(CXX_VERSION "")