updated configuration for armv7l-linux-gnueabihf (#302)

Long story short: `ErlNapiSInt64` defined in `erl_drv_nif.h` becomes signed 
32-bit integer when cross-compiling for an `armv7l` target on an `x86_64` host.

The old but gold `printf` debugging:

    case SQLITE_INTEGER: {
        int64_t value = sqlite3_column_int64(statement, i);
        sqlite_int64 v = value;
        printf("sqlite3_column_int64: int64_t %lld\r\n", value);
        printf("sqlite3_column_int64: sqlite_int64 %lld\r\n", v);
        printf("sizeof(ErlNapiSInt64): %ld\r\n", sizeof(ErlNapiSInt64));
        return enif_make_int64(env, v);
    }

Output:

    sqlite3_column_int64: int64_t 20221010123504
    sqlite3_column_int64: sqlite_int64 20221010123504
    sizeof(ErlNapiSInt64): 4

Signed-off-by: Cocoa <i@uwucocoa.moe>

.github/workflows/linux-precompile.yml

@@ -9,6 +9,59 @@ permissions:
   contents: write
 
 jobs:
+  armv7l-linux-gnueabihf:
+    runs-on: ubuntu-latest
+    env:
+      ARCH: armv7l
+      TARGET: armv7l-linux-gnueabihf
+    strategy:
+      matrix:
+        job:
+          - {otp: "27.1.1", elixir: "1.17"}
+          - {otp: "25.3.2.14", elixir: "1.16"}
+
+    name: Linux armv7l - OTP ${{ matrix.job.otp }} - Elixir ${{ matrix.job.elixir }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - uses: erlef/setup-beam@v1
+        with:
+          otp-version: ${{ matrix.job.otp }}
+          elixir-version: ${{ matrix.job.elixir }}
+
+      - name: Install system dependecies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            build-essential automake autoconf pkg-config \
+            bc m4 unzip zip gcc g++
+
+      - name: Install armv7l specific deps
+        run: sudo apt-get install -y gcc-arm-linux-gnueabihf g++-arm-linux-gnueabihf
+
+      - name: Create precompiled ${{ env.ARCH }} library
+        run: |
+          ROOTDIR="$(pwd)"
+          OTP_ROOTDIR="${ROOTDIR}/.tools/otp"
+          mkdir -p "${OTP_ROOTDIR}"
+          cd "${OTP_ROOTDIR}"
+          curl -fSL "https://github.com/cocoa-xu/otp-build/releases/download/v${{ matrix.job.otp }}/otp-${{ env.TARGET }}.tar.gz" -o "otp-${{ env.TARGET }}.tar.gz"
+          tar -xzf "otp-${{ env.TARGET }}.tar.gz"
+          cd "${ROOTDIR}"
+
+          export PRECOMPILE_ERL_EI_INCLUDE_DIR="${OTP_ROOTDIR}/usr/local/lib/erlang/usr/include"
+          export ELIXIR_MAKE_CACHE_DIR=$(pwd)/cache
+          mkdir -p "${ELIXIR_MAKE_CACHE_DIR}"
+          mix deps.get
+          mix elixir_make.precompile
+
+      - uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          files: |
+            cache/*${{ env.TARGET }}*.tar.gz
+
   precompile:
     runs-on: ubuntu-20.04
     env:
@@ -44,7 +97,6 @@ jobs:
         if: matrix.arch == 'x86_64'
         run: |
           sudo apt-get install -y gcc-i686-linux-gnu g++-i686-linux-gnu \
-            gcc-arm-linux-gnueabihf g++-arm-linux-gnueabihf \
             gcc-powerpc64le-linux-gnu g++-powerpc64le-linux-gnu \
             gcc-s390x-linux-gnu g++-s390x-linux-gnu
 

Makefile

@@ -115,7 +115,11 @@ ifneq ($(EXQLITE_SYSTEM_CFLAGS),)
 endif
 
 # Set Erlang-specific compile flags
-ERL_CFLAGS ?= -I"$(ERL_EI_INCLUDE_DIR)"
+ifeq ($(CC_PRECOMPILER_CURRENT_TARGET),armv7l-linux-gnueabihf)
+	ERL_CFLAGS ?= -I"$(PRECOMPILE_ERL_EI_INCLUDE_DIR)"
+else
+	ERL_CFLAGS ?= -I"$(ERL_EI_INCLUDE_DIR)"
+endif
 
 ifneq ($(STATIC_ERLANG_NIF),)
 	CFLAGS += -DSTATIC_ERLANG_NIF=1