dont hide behind make for a minute

.github/workflows/ubuntu.yml

@@ -131,8 +131,7 @@ jobs:
       - name: Build shared GC (${{ matrix.gc_name }})
         run: |
           mkdir ${{ matrix.shared_gc_dir }} &&
-          make -n shared-gc SHARED_GC=${{ matrix.gc_name }} MMTK_BUILD=release &&
-          make shared-gc SHARED_GC=${{ matrix.gc_name }} MMTK_BUILD=release &&
+          gcc -shared -I../src/include -I../src -I.ext/include/x86_64-linux -Wl,--compress-debug-sections=zlib -L../src/gc/mmtk/target/release -lmmtk_ruby -fstack-protector-strong -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2  -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wdeprecated-declarations -Wdiv-by-zero -Wduplicated-cond -Wimplicit-function-declaration -Wimplicit-int -Wpointer-arith -Wwrite-strings -Wold-style-definition -Wimplicit-fallthrough=0 -Wmissing-noreturn -Wno-cast-function-type -Wno-constant-logical-operand -Wno-long-long -Wno-missing-field-initializers -Wno-overlength-strings -Wno-packed-bitfield-compat -Wno-parentheses-equality -Wno-self-assign -Wno-tautological-compare -Wno-unused-parameter -Wno-unused-value -Wsuggest-attribute=format -Wsuggest-attribute=noreturn -Wunused-variable -Wmisleading-indentation -Wundef  -DBUILDING_SHARED_GC -fPIC -o /home/runner/ruby_gc/librubygc.mmtk.so ../src/gc/mmtk.c &&
           ldd ${{ matrix.shared_gc_dir }}/librubygc.mmtk.so
         if: ${{ matrix.shared_gc }}