Remove obsolete rust VariantIsStatic

Rust modules no longer have static variants after
I2925f67f6dc9329dae3dcccafb8560900ac8a6fc, remove the VariantIsStatic
field.

Bug: 254469782
Test: m
Test: m blueprint_tests
Change-Id: Ic63412a27c3a09dec43c4a9064a3e1f4181147db
diff --git a/rust/library.go b/rust/library.go
index 96c02c8..ba73f27 100644
--- a/rust/library.go
+++ b/rust/library.go
@@ -86,8 +86,6 @@
 	VariantIsRlib bool `blueprint:"mutated"`
 	// This variant is a shared library
 	VariantIsShared bool `blueprint:"mutated"`
-	// This variant is a static library
-	VariantIsStatic bool `blueprint:"mutated"`
 	// This variant is a source provider
 	VariantIsSource bool `blueprint:"mutated"`
 
@@ -179,7 +177,7 @@
 }
 
 func (library *libraryDecorator) static() bool {
-	return library.MutatedProperties.VariantIsStatic
+	return false
 }
 
 func (library *libraryDecorator) source() bool {
@@ -205,14 +203,12 @@
 func (library *libraryDecorator) setRlib() {
 	library.MutatedProperties.VariantIsRlib = true
 	library.MutatedProperties.VariantIsDylib = false
-	library.MutatedProperties.VariantIsStatic = false
 	library.MutatedProperties.VariantIsShared = false
 }
 
 func (library *libraryDecorator) setDylib() {
 	library.MutatedProperties.VariantIsRlib = false
 	library.MutatedProperties.VariantIsDylib = true
-	library.MutatedProperties.VariantIsStatic = false
 	library.MutatedProperties.VariantIsShared = false
 }
 
@@ -229,17 +225,13 @@
 }
 
 func (library *libraryDecorator) setShared() {
-	library.MutatedProperties.VariantIsStatic = false
 	library.MutatedProperties.VariantIsShared = true
 	library.MutatedProperties.VariantIsRlib = false
 	library.MutatedProperties.VariantIsDylib = false
 }
 
 func (library *libraryDecorator) setStatic() {
-	library.MutatedProperties.VariantIsStatic = true
-	library.MutatedProperties.VariantIsShared = false
-	library.MutatedProperties.VariantIsRlib = false
-	library.MutatedProperties.VariantIsDylib = false
+	panic(fmt.Errorf("static variant is not supported for rust modules, use the rlib variant instead"))
 }
 
 func (library *libraryDecorator) setSource() {