Use a submodule for objcryst (rather than a complicated upstream approach)

Author: vincefn

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "src/objcryst"]
+	path = src/objcryst
+	url = https://github.com/vincefn/objcryst

.travis.yml

@@ -105,7 +105,7 @@ install:
   # Verify version of the installed library.
   - MYINCLUDE="${MYPREFIX}/include"
   - MYLIB="${MYPREFIX}/lib"
-  - MYVERSION="${MYINCLUDE}/ObjCryst/version.h"
+  - MYVERSION="${MYINCLUDE}/version/version.h"
   - MYGIT_REV=$(grep '^#define LIBOBJCRYST_GIT_COMMIT' "$MYVERSION" | cut -d '"' -f 2)
   - if [[ "${MYCOMMIT}" != "${MYGIT_REV}" ]]; then
         echo "Version mismatch ${MYCOMMIT} vs ${MYGIT_REV}.";

site_scons/fallback_version.py

@@ -7,4 +7,4 @@
 Update FALLBACK_VERSION when tagging a new release.
 '''
 
-FALLBACK_VERSION = '2024.1.1'
+FALLBACK_VERSION = '2024.1.1.post0'