Update latest.Dockerfile

- Add patch for rts/RtsSymbols.c

latest.Dockerfile

@@ -3,6 +3,8 @@ ARG CABAL_VERSION_BUILD
 
 FROM registry.gitlab.b-data.ch/ghc/ghc4pandoc:9.0.1 as bootstrap
 
+COPY patches/* /tmp/
+
 ENV GHC_VERSION=${GHC_VERSION_BUILD:-9.2.1}
 ENV CABAL_VERSION=${CABAL_VERSION_BUILD:-3.6.0.0}
 
@@ -31,6 +33,9 @@ RUN cd /tmp \
   && gpg --verify ghc-$GHC_VERSION-src.tar.xz.sig ghc-$GHC_VERSION-src.tar.xz \
   && tar xf ghc-$GHC_VERSION-src.tar.xz \
   && cd ghc-$GHC_VERSION \
+  # Apply patches
+  && mv /tmp/*.patch . \
+  && patch -p0 <ghc-9.2.1-RtsSymbols.patch \
   # Use the LLVM backend
   && cp mk/build.mk.sample mk/build.mk \
   && echo 'BuildFlavour=perf-llvm' >> mk/build.mk \

patches/ghc-9.2.1-RtsSymbols.patch

+--- rts/RtsSymbols.c	2021-10-28 22:41:34.000000000 +0200
++++ rts/RtsSymbols.c.patched	2021-12-01 17:04:02.000000000 +0100
+@@ -33,6 +33,11 @@
+ #include <elf.h> /* _DYNAMIC */
+ #endif
+ 
++/* We must provide a prototype for environ since depending upon the libc
++ * version it may or may not be provided by unistd.h. See #20577.
++ */
++extern char **environ;
++
+ /* -----------------------------------------------------------------------------
+  * Symbols to be inserted into the RTS symbol table.
+  */
+@@ -60,7 +65,6 @@
+       SymI_HasProto(stg_sig_install)            \
+       SymI_HasProto(rtsTimerSignal)             \
+       SymI_HasProto_redirect(atexit, atexit, STRENGTH_STRONG) /* See Note [Strong symbols] */ \
+-      SymI_NeedsDataProto(environ)              \
+       SymI_NeedsDataProto(nocldstop)
+ #endif
+