new test: cc_lapack

- extended math_libs.cmake for C headers detection
- static_linking tests included
- rearranged math-libs order for better libraries detection
- no int64 for cc_lapack
- added include/ directory to %path% to detect clapack.h in appveyor
- simplified C-code, intendations kept
- travis-ci kept simple, but needs liblapack-dev and libatlas-base-dev
- libatlas-dev can not be installed due to repeating xerba objects in *.a lib
  files

test/cc_clapack/cmake/autocmake.cfg

@@ -0,0 +1,17 @@
+[project]
+name: example
+
+[cc]
+source: ../../../modules/cc.cmake
+
+[static]
+source: ../../../modules/static_linking.cmake
+
+[math_libs]
+source: ../../../modules/math_libs.cmake
+
+[default_build_paths]
+source: ../../../modules/default_build_paths.cmake
+
+[src]
+source: ../../../modules/src.cmake