Merge pull request #19577 from bradcray/build-version-1-for-1-26

Bump build version to 1 on 1.26 branch to reflect late-breaking changes

[reviewed by @ronawho]

If I've kept my facts straight, this should bump the build version for the
1.26 branch to "1" the next time we respin the tarball, reflecting the
changes in #19575.
Unfortunately, I won't feel confident that this is working as intended
until we merge and try to respin the tarball (either manually or via
Jenkins).

Elliot points out that with the current `--version` logic, this will only
show up with `--devel --version` (which looks like a mistake to me,
but one to fix back on `main` rather than here).

compiler/Makefile

@@ -143,7 +143,7 @@ UPDATE_BUILD_VERSION = $(CHPL_MAKE_HOME)/util/devel/updateBuildVersion
 $(BUILD_VERSION_FILE): FORCE
 	@({ test -e $(CHPL_MAKE_HOME)/.git ; } && \
 	test -x $(UPDATE_BUILD_VERSION) && $(UPDATE_BUILD_VERSION) $@ $(CHPL_MAKE_HOME)) || \
-	test -r $(BUILD_VERSION_FILE) || (echo '"0"' > $@);
+	test -r $(BUILD_VERSION_FILE) || (echo '"1"' > $@);
 
 $(CHPL_MAKE_HOME)/configured-prefix:
 	echo > $(CHPL_MAKE_HOME)/configured-prefix