gnu: glad: Rename to glad-0.1.

* gnu/packages/gl.scm (glad): Rename variable to...
(glad-0.1): ...this.
* gnu/packages/electronics.scm (openboardview)[native-inputs]:
Adjust accordingly.

Change-Id: I5a9068186a899b8ff76feb51fd44f59e71cdb030

gnu/packages/electronics.scm

@@ -310,7 +310,7 @@ supported devices, as well as input/output file format support.")
     (native-inputs
      (list pkg-config
            python
-           glad
+           glad-0.1
            stb-image
            utf8-h))
     (inputs

gnu/packages/gl.scm

@@ -189,7 +189,7 @@ rendering modes are: Bitmaps, Anti-aliased pixmaps, Texture maps, Outlines,
 Polygon meshes, and Extruded polygon meshes.")
     (license license:x11)))
 
-(define-public glad
+(define-public glad-0.1
   (package
     (name "glad")
     (version "0.1.36")