Extend FindPHP.cmake module

This enables using the same find module in various scenarios:
- building PHP extension with CMake
- building application with embedded PHP
- finding only PHP executable

Author: petk

.github/workflows/ci.yaml

@@ -138,3 +138,19 @@ jobs:
       - name: Run tests
         run: |
           ctest --preset all-enabled
+
+      - name: Install PHP
+        run: |
+          cd php-${{ matrix.php }}
+          cmake --install php-build/all-enabled
+
+      - name: Setup shared standalone extension
+        run: |
+          cd php-${{ matrix.php }}
+          php ext/ext_skel.php --ext phantom
+          mkdir ext/phantom/cmake/modules
+          cp cmake/modules/FindPHP.cmake ext/phantom/cmake/modules
+          cmake -S ext/phantom -B ext/phantom/cmake-build
+          cmake --build ext/phantom/cmake-build -j
+          cmake --install ext/phantom/cmake-build
+          #php -d extension=phantom -m | grep phantom

cmake/cmake/Requirements.cmake

@@ -56,6 +56,4 @@ find_package(Sendmail)
 # used at the build phase, where possible. The minimum version should match the
 # version required to run these PHP scripts.
 ################################################################################
-block(PROPAGATE PHP_FOUND)
-  find_package(PHP 7.4)
-endblock()
+find_package(PHP 7.4 COMPONENTS Interpreter)