fix *.in files being mistakenly ignored by git, fixed missing cmake.hpp.in

.gitignore

@@ -1,4 +1,3 @@
-*.in
 *.o
 *.so
 */.deps

include/cmake.hpp.in

@@ -0,0 +1,5 @@
+#pragma once
+
+#cmakedefine IS_GIT_REPO "@IS_GIT_REPO@"
+#cmakedefine GIT_COMMIT_HASH "@GIT_COMMIT_HASH@"
+#cmakedefine GIT_BRANCH "@GIT_BRANCH@"