libelas: add a patch for a minor issue

recipes/libelas/all/conandata.yml

@@ -6,3 +6,8 @@ sources:
     license:
       url: "https://raw.githubusercontent.com/kou1okada/libelas/master/README.TXT"
       sha256: "627924f4cb0fe790de303fe721233d227a6d0c1734ed39fa4641923dcb9c5b8f"
+patches:
+  "cci.20150630":
+    - patch_file: "patches/001-fix-cast.patch"
+      patch_type: "portability"
+      patch_description: "Add a missing explicit cast from int to float"

recipes/libelas/all/conanfile.py

@@ -3,7 +3,7 @@
 from conan import ConanFile
 from conan.tools.build import check_min_cppstd
 from conan.tools.cmake import CMake, CMakeToolchain, cmake_layout, CMakeDeps
-from conan.tools.files import copy, get, rm, download, load, save
+from conan.tools.files import copy, get, rm, download, load, save, export_conandata_patches, apply_conandata_patches
 
 required_conan_version = ">=1.53.0"
 
@@ -28,6 +28,7 @@ class LibelasConan(ConanFile):
     }
 
     def export_sources(self):
+        export_conandata_patches(self)
         copy(self, "CMakeLists.txt", self.recipe_folder, os.path.join(self.export_sources_folder, "src"))
 
     def config_options(self):
@@ -60,6 +61,7 @@ def generate(self):
         deps.generate()
 
     def build(self):
+        apply_conandata_patches(self)
         cmake = CMake(self)
         cmake.configure()
         cmake.build()

recipes/libelas/all/patches/001-fix-cast.patch

@@ -0,0 +1,13 @@
+Fix
+error: non-constant-expression cannot be narrowed from type 'int32_t' (aka 'int') to 'float' in initializer list [-Wc++11-narrowing]
+--- elas.cpp
++++ elas.cpp
+@@ -874,7 +874,7 @@
+ 			tri_u[1] = p_support[c2].u-p_support[c2].d;
+ 			tri_u[2] = p_support[c3].u-p_support[c3].d;
+ 		}
+-		float tri_v[3] = {p_support[c1].v,p_support[c2].v,p_support[c3].v};
++		float tri_v[3] = {static_cast<float>(p_support[c1].v), static_cast<float>(p_support[c2].v), static_cast<float>(p_support[c3].v)};
+
+ 		for (uint32_t j=0; j<3; j++) {
+ 			for (uint32_t k=0; k<j; k++) {