Revert "customization: overridable SHA_SUM"

This reverts commit d19fd9b.

rationale:

They are now using SHA-3 for SQLite amalgamation;
now only using SHA-1 for extension functions which
are currently not supported in this fork.

Author: Christopher J. Brody

Makefile

@@ -16,7 +16,6 @@ EXTENSION_FUNCTIONS_URL = https://www.sqlite.org/contrib/download/extension-func
 EXTENSION_FUNCTIONS_SHA1 = c68fa706d6d9ff98608044c00212473f9c14892f
 
 EMCC=emcc
-SHA_SUM=sha1sum # TODO submit to upstream sql-js version
 
 CFLAGS = \
 	-O2 \
@@ -179,15 +178,15 @@ sqlite-src: sqlite-src/$(SQLITE_AMALGAMATION) sqlite-src/$(EXTENSION_FUNCTIONS)
 sqlite-src/$(SQLITE_AMALGAMATION): cache/$(SQLITE_AMALGAMATION).zip
 	mkdir -p sqlite-src
 	echo '$(SQLITE_AMALGAMATION_ZIP_SHA1)  ./cache/$(SQLITE_AMALGAMATION).zip' > cache/check.txt
-	$(SHA_SUM) -c cache/check.txt
+	sha1sum -c cache/check.txt
 	rm -rf $@
 	unzip -u 'cache/$(SQLITE_AMALGAMATION).zip' -d sqlite-src/
 	touch $@
 
 sqlite-src/$(SQLITE_AMALGAMATION)/$(EXTENSION_FUNCTIONS): cache/$(EXTENSION_FUNCTIONS)
 	mkdir -p sqlite-src
 	echo '$(EXTENSION_FUNCTIONS_SHA1)  ./cache/$(EXTENSION_FUNCTIONS)' > cache/check.txt
-	$(SHA_SUM) -c cache/check.txt
+	sha1sum -c cache/check.txt
 	cp 'cache/$(EXTENSION_FUNCTIONS)' $@
 
 

README.md

@@ -22,7 +22,6 @@ Sql.js predates WebAssembly, and thus started as an [asm.js](https://en.wikipedi
 - remove extension-functions from build
 - enable FTS4
 - enable R-Tree
-- overridable `SHA_SUM` definition in Makefile
 
 ## Documentation
 A [full documentation](https://sql-js.github.io/sql.js/documentation/class/Database.html) generated from comments inside the source code, is available.