WIP: update conan recipe for c interface

conanfile.py

@@ -14,7 +14,7 @@ class CaosdbConan(ConanFile):
     default_options = {"shared": False, "fPIC": True}
     generators = "cmake"
     requires = [("boost/1.76.0"), ("gtest/1.11.0"), ("grpc/1.38.0")]
-    exports = "*.cpp", "*h", "*.cmake", "*CMakeLists.txt", "*.in", "*.proto"
+    exports = "*.cpp", "*.h", "*.cmake", "*CMakeLists.txt", "*.in", "*.proto", "*.c"
     exports_sources = "src", "doc", "include", "test", "cmake", "proto"
 
     def config_options(self):
@@ -47,4 +47,4 @@ class CaosdbConan(ConanFile):
         self.copy("*.a", dst="lib", keep_path=False)
 
     def package_info(self):
-        self.cpp_info.libs = ["caosdb"]
+        self.cpp_info.libs = ["caosdb", "ccaosdb"]