Convert 5 m4 checks to cmake modules

cmake/CheckComplexMath2.cmake

@@ -0,0 +1,22 @@
+INCLUDE(CheckCXXSourceCompiles)
+
+MACRO (CHECK_COMPLEX_MATH2 _RESULT)
+
+SET(_CHECK_COMPLEX_MATH2_SOURCE_CODE "
+
+#include<complex>
+
+using namespace std;
+
+int main(int argc, char *argv[])
+{
+  complex<double> x(1.0, 1.0), y(1.0, 1.0);
+  acos(x); asin(x); atan(x); atan2(x,y); atan2(x, double(3.0));
+  atan2(double(3.0), x); log10(x); return 0;
+}
+
+")
+
+CHECK_CXX_SOURCE_COMPILES("${_CHECK_COMPLEX_MATH2_SOURCE_CODE}" ${_RESULT})
+
+ENDMACRO (CHECK_COMPLEX_MATH2)