gnulib-tool.py: Don't ignore the argument to --doc-base.

[Collin Funk]

When building GNU PSPP I see this:

--- /home/collin/.local/src/pspp/gl/m4/gnulib-cache.m4  2024-04-02 
18:10:06.209522277 -0700
+++ /home/collin/.local/src/glpyXBzSID/gl/m4/gnulib-cache.m4    2024-04-02 
18:09:37.828467148 -0700
@@ -31,7 +31,7 @@
 #  --lib=libgl \
 #  --source-base=gl \
 #  --m4-base=gl/m4 \
-#  --doc-base=gl/doc \
+#  --doc-base=doc \
 #  --tests-base=tests \
 #  --aux-dir=build-aux \
 #  --makefile-name=automake.mk \
@@ -302,7 +302,7 @@
 gl_SOURCE_BASE([gl])
 gl_M4_BASE([gl/m4])
 gl_PO_BASE([])
-gl_DOC_BASE([gl/doc])
+gl_DOC_BASE([doc])
 gl_TESTS_BASE([tests])
 gl_LIB([libgl])
 gl_MAKEFILE_NAME([automake.mk])

This patch fixes it. It seems that gnulib-tool.py never respected the
directory passed with --doc-base.

PSPP doesn't use the bootstrap script, and running make without a
target will fail with GNULIB_TOOL_IMPL=sh+py because of some *.png
files.

This seems to work:

       env GNUMAKEFLAGS="" GNULIB_TOOL_IMPL=sh+py make -f Smake prep_ph

Collin

0001-gnulib-tool.py-Don-t-ignore-the-argument-to-doc-base.patch
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