[hgi] Fixed inline function declarations

Removed the 'inline' specifier from several operator==()
and operator!=() functions that are defined only in the
corresponding cpp files and can't be instantiated inline.

This is modified from the original PR which addressed only
hgi/shaderProgram.h

(Thanks to Maddy Adams)

Closes PixarAnimationStudios#3682

(Internal change: 2370680)

Author: dgovil

pxr/imaging/hgi/buffer.h

@@ -65,7 +65,7 @@ bool operator==(
     const HgiBufferDesc& rhs);
 
 HGI_API
-inline bool operator!=(
+bool operator!=(
     const HgiBufferDesc& lhs,
     const HgiBufferDesc& rhs);
 

pxr/imaging/hgi/graphicsPipeline.h

@@ -54,7 +54,7 @@ bool operator==(
     const HgiVertexAttributeDesc& rhs);
 
 HGI_API
-inline bool operator!=(
+bool operator!=(
     const HgiVertexAttributeDesc& lhs,
     const HgiVertexAttributeDesc& rhs);
 

pxr/imaging/hgi/resourceBindings.h

@@ -80,7 +80,7 @@ bool operator==(
     const HgiBufferBindDesc& rhs);
 
 HGI_API
-inline bool operator!=(
+bool operator!=(
     const HgiBufferBindDesc& lhs,
     const HgiBufferBindDesc& rhs);
 

pxr/imaging/hgi/shaderProgram.h

@@ -41,12 +41,12 @@ struct HgiShaderProgramDesc
 };
 
 HGI_API
-inline bool operator==(
+bool operator==(
     const HgiShaderProgramDesc& lhs,
     const HgiShaderProgramDesc& rhs);
 
 HGI_API
-inline bool operator!=(
+bool operator!=(
     const HgiShaderProgramDesc& lhs,
     const HgiShaderProgramDesc& rhs);