.github/workflows/compilers.yml: disable shared for LTO

LTO is about static links.  Makes no sense to have DLLs.

.github/workflows/compilers.yml

@@ -20,7 +20,6 @@ env:
   debugflags: '-ggdb3'
 
   default_configure: >-
-    --enable-shared
     --enable-debug-env
     --disable-install-doc
     --with-ext=-test-/cxxanyargs,+
@@ -60,6 +59,7 @@ jobs:
             name: 'gcc-11 LTO'
             value: 'gcc-11 -O2 -flto=auto -ffat-lto-objects'
             container: gcc-11
+            shared: '--disable-shared'
             # check: true
           - { key: default_cc, name: clang-14,  value: clang-14,  container: clang-14 }
           - { key: default_cc, name: clang-13,  value: clang-13,  container: clang-13 }
@@ -77,6 +77,7 @@ jobs:
             name: 'clang-14 LTO'
             value: 'clang-14 -O2 -flto=auto'
             container: clang-14
+            shared: '--disable-shared'
             # check: true
 
           - { key: crosshost, name: aarch64-linux-gnu,     value: aarch64-linux-gnu, container: crossbuild-essential-arm64 }
@@ -190,6 +191,7 @@ jobs:
         run: >
           ../src/configure -C ${default_configure} ${append_configure}
           ${{ matrix.entry.key == 'crosshost' && '--host="${crosshost}"' || '--with-gcc="${default_cc} ${append_cc}"' }}
+          ${{ matrix.entry.shared || '--enable-shared' }}
       - run: $make extract-extlibs
       - run: $make incs
       - run: $make