convert submodules to normal folders for now

raylib/projects/Builder/examples/meson.build

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+# This file should be in the main folder of your project
+
+# Replace 'projectname' with the name of your project
+# Replace '1.0' with its version
+project('core_basic_window', 'c', version: '1.0',
+        meson_version: '>= 0.39.1')
+
+# We want a C Compiler to be present
+cc = meson.get_compiler('c')
+
+# Find dependencies
+gl_dep = dependency('gl')
+m_dep = cc.find_library('m', required : false)
+raylib_dep = cc.find_library('raylib', required : false)
+
+# List your source files here
+source_c = [
+  '../../../examples/core/core_basic_window.c',
+]
+
+# Build executable
+core_basic_window = executable('core_basic_window',
+  source_c,
+  dependencies : [ raylib_dep, gl_dep, m_dep ],
+  install : true)