ci: add -lm and allow-multiple-definition for bootstrap build

el_runtime.c uses pow/sqrt/log/sin/cos/exp - needs -lm.
elc-bootstrap.c predates the text-processing primitives commit so it
has its own C definitions of is_digit/is_whitespace; -Wl,--allow-multiple-definition
lets the linker accept both (equivalent implementations).

.gitea/workflows/ci-dev.yaml

@@ -23,13 +23,17 @@ jobs:
           apt-get install -y gcc libcurl4-openssl-dev
 
       # Gen2: compile the bootstrap C source into a working elc binary
+      # -Wl,--allow-multiple-definition: is_digit/is_whitespace exist in both
+      # elc-bootstrap.c (pre-dates runtime text primitives) and el_runtime.c.
+      # Both definitions are equivalent; allow the linker to pick one.
       - name: Build elc from bootstrap (gen2)
         run: |
           gcc -O2 \
             -I el-compiler/runtime \
             dist/elc-bootstrap.c \
             el-compiler/runtime/el_runtime.c \
-            -lcurl -lpthread \
+            -lcurl -lpthread -lm \
+            -Wl,--allow-multiple-definition \
             -o dist/elc-gen2
           chmod +x dist/elc-gen2
           echo "gen2 elc built"
@@ -44,7 +48,7 @@ jobs:
             -I el-compiler/runtime \
             dist/elc-gen3.c \
             el-compiler/runtime/el_runtime.c \
-            -lcurl -lpthread \
+            -lcurl -lpthread -lm \
             -o dist/platform/elc
           chmod +x dist/platform/elc
           echo "gen3 (self-hosted) elc built"
@@ -83,7 +87,7 @@ jobs:
           RUNTIME="$(pwd)/el-compiler/runtime"
           "$ELC" --test tests/native/test_text.el > /tmp/el_native_text.c
           gcc -O2 -I "$RUNTIME" /tmp/el_native_text.c "$RUNTIME/el_runtime.c" \
-            -lcurl -lpthread -o /tmp/el_native_text
+            -lcurl -lpthread -lm -o /tmp/el_native_text
           /tmp/el_native_text
 
       # Publish artifact to GCP Artifact Registry (dev)