don't pass unused envs

Author: henderkes

src/SPC/builder/linux/LinuxBuilder.php

@@ -377,12 +377,12 @@ private function getMakeExtraVars(): array
         $config = (new SPCConfigUtil($this, ['libs_only_deps' => true, 'absolute_libs' => true]))->config($this->ext_list, $this->lib_list, $this->getOption('with-suggested-exts'), $this->getOption('with-suggested-libs'));
         $static = SPCTarget::isStatic() ? '-all-static' : '';
         $lib = BUILD_LIB_PATH;
-        return [
+        return array_filter([
             'EXTRA_CFLAGS' => getenv('SPC_CMD_VAR_PHP_MAKE_EXTRA_CFLAGS'),
             'EXTRA_LIBS' => $config['libs'],
             'EXTRA_LDFLAGS' => getenv('SPC_CMD_VAR_PHP_MAKE_EXTRA_LDFLAGS'),
             'EXTRA_LDFLAGS_PROGRAM' => "-L{$lib} {$static} -pie",
-        ];
+        ]);
     }
 
     /**

src/SPC/builder/macos/MacOSBuilder.php

@@ -281,10 +281,10 @@ protected function buildEmbed(): void
     private function getMakeExtraVars(): array
     {
         $config = (new SPCConfigUtil($this, ['libs_only_deps' => true]))->config($this->ext_list, $this->lib_list, $this->getOption('with-suggested-exts'), $this->getOption('with-suggested-libs'));
-        return [
+        return array_filter([
             'EXTRA_CFLAGS' => getenv('SPC_CMD_VAR_PHP_MAKE_EXTRA_CFLAGS'),
             'EXTRA_LDFLAGS_PROGRAM' => '-L' . BUILD_LIB_PATH,
             'EXTRA_LIBS' => $config['libs'],
-        ];
+        ]);
     }
 }