Test for Windows resource compilation reusing the same script name

Extended from the test case in #3575.

This exercises File objects and string filenames for the same resource
script filename at different paths.

test cases/windows/16 resource scripts with duplicate filenames/a/meson.build

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+a = win.compile_resources('rsrc.rc')

test cases/windows/16 resource scripts with duplicate filenames/a/rsrc.rc

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+a RCDATA { "a" }

test cases/windows/16 resource scripts with duplicate filenames/b/meson.build

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+bf = files('rsrc.rc')
+b = win.compile_resources(bf)

test cases/windows/16 resource scripts with duplicate filenames/b/rsrc.rc

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+b RCDATA { "b" }

test cases/windows/16 resource scripts with duplicate filenames/c/meson.build

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+cf = files('rsrc.rc')
+c = win.compile_resources(cf)

test cases/windows/16 resource scripts with duplicate filenames/c/rsrc.rc

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+c RCDATA { "c" }

test cases/windows/16 resource scripts with duplicate filenames/meson.build

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+project('foobar', 'c')
+
+win = import('windows')
+
+subdir('a')
+subdir('b')
+subdir('c')
+
+main = win.compile_resources('rsrc.rc')
+
+# these make the resource compilation a dependency of something which is built
+# by default
+static_library('libmain', main)
+static_library('liba', a)
+static_library('libb', b)
+static_library('libc', c)

test cases/windows/16 resource scripts with duplicate filenames/rsrc.rc

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+main RCDATA { "main" }