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/test.py

@@ -205,6 +205,14 @@ def test_fc_lapack():
 def test_fc_lapack_static():
     configure_build_and_exe('fc_lapack', 'python setup.py --fc=gfortran --static --cmake-options="-DMATH_LIB_SEARCH_ORDER=\'OPENBLAS;ATLAS;MKL;SYSTEM_NATIVE\'"')
 
+
+def test_cc_clapack():
+    configure_build_and_exe('cc_clapack', 'python setup.py --cc=gcc --cmake-options="-DMATH_LIB_SEARCH_ORDER=\'OPENBLAS;ATLAS;MKL;SYSTEM_NATIVE\'"')
+
+
+def test_cc_clapack_static():
+    configure_build_and_exe('cc_clapack', 'python setup.py --cc=gcc --static --cmake-options="-DMATH_LIB_SEARCH_ORDER=\'OPENBLAS;ATLAS;MKL;SYSTEM_NATIVE\'"')
+
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