Rename GRDB_DOCC_PLUGIN to SPI_BUILDER

This addresses SwiftPackageIndex/SwiftPackageIndex-Server#2122 (comment)

Author: groue

Makefile

@@ -486,7 +486,7 @@ doc-localhost:
 	# Generates documentation in ~/Sites/GRDB
 	# See https://discussions.apple.com/docs/DOC-3083 for Apache setup on the mac
 	mkdir -p ~/Sites/GRDB
-	GRDB_DOCC_PLUGIN=1 $(SWIFT) package \
+	SPI_BUILDER=1 $(SWIFT) package \
 	  --allow-writing-to-directory ~/Sites/GRDB \
 	  generate-documentation \
 	  --output-path ~/Sites/GRDB \
@@ -500,7 +500,7 @@ doc:
 	# https://apple.github.io/swift-docc-plugin/documentation/swiftdoccplugin/publishing-to-github-pages/
 	rm -rf $(DOCS_PATH)
 	mkdir -p $(DOCS_PATH)
-	GRDB_DOCC_PLUGIN=1 $(SWIFT) package \
+	SPI_BUILDER=1 $(SWIFT) package \
 	  --allow-writing-to-directory $(DOCS_PATH) \
 	  generate-documentation \
 	  --output-path $(DOCS_PATH) \

Package.swift

@@ -19,7 +19,7 @@ if ProcessInfo.processInfo.environment["SQLITE_ENABLE_PREUPDATE_HOOK"] == "1" {
 // Don't rely on this environment variable. It is only a convenience:
 // $ make docs-localhost
 var dependencies: [PackageDescription.Package.Dependency] = []
-if ProcessInfo.processInfo.environment["GRDB_DOCC_PLUGIN"] == "1" {
+if ProcessInfo.processInfo.environment["SPI_BUILDER"] == "1" {
     dependencies.append(.package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0"))
 }