gps-raspbian: use --enable-big-digits=15

Add SlowNonDebugUnixBuild15BitDigits build class and use it for
the gps-raspbian builder to configure Python with 15-bit digits.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: gpshead

master/custom/builders.py

@@ -23,6 +23,7 @@
     SharedUnixBuild,
     SlowDebugUnixBuild,
     SlowNonDebugUnixBuild,
+    SlowNonDebugUnixBuild15BitDigits,
     SlowUnixInstalledBuild,
     NonDebugUnixBuild,
     UnixInstalledBuild,
@@ -157,7 +158,7 @@
     ("PPC64LE Fedora Stable Clang Installed", "cstratak-fedora-stable-ppc64le", ClangUnixInstalledBuild),
 
     # Linux armv7l (32-bit) GCC
-    ("ARM Raspbian", "gps-raspbian", SlowNonDebugUnixBuild),
+    ("ARM Raspbian", "gps-raspbian", SlowNonDebugUnixBuild15BitDigits),
 
     # Linux armv8 (64-bit) GCC
     ("ARM64 Raspbian", "stan-raspbian", SlowNonDebugUnixBuild),

master/custom/factories.py

@@ -379,6 +379,10 @@ class SlowNonDebugUnixBuild(NonDebugUnixBuild):
     testFlags = [*NonDebugUnixBuild.testFlags, "-u-cpu"]
 
 
+class SlowNonDebugUnixBuild15BitDigits(SlowNonDebugUnixBuild):
+    configureFlags = [*SlowNonDebugUnixBuild.configureFlags, "--enable-big-digits=15"]
+
+
 class SlowDebugUnixBuild(UnixBuild):
     test_timeout = SLOW_TIMEOUT
     testFlags = [*UnixBuild.testFlags, "-u-cpu"]