Add tests of new .h file resolution

tests/compile_tests/declare_library_header/directory/fastmath.h

@@ -0,0 +1,6 @@
+
+// Fake function for testing
+int Fast_Sqrt(int value)
+{
+    return value * 2;
+}

tests/compile_tests/declare_library_header/test-compile-base-directory.bas

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+$CONSOLE:ONLY
+
+DECLARE LIBRARY "directory/fastmath"
+   FUNCTION Fast_Sqrt&(BYVAL val AS LONG)
+END DECLARE
+
+value = Fast_Sqrt&(2000)
+print value;
+SYSTEM

tests/compile_tests/declare_library_header/test-compile-base-directory.output

@@ -0,0 +1 @@
+ 4000 

tests/compile_tests/declare_library_header/test-compile-base.bas

@@ -0,0 +1,11 @@
+$CONSOLE:ONLY
+
+' This location is relative to the source file, not QB64-PE or the location
+' QB64-PE was run from.
+DECLARE LIBRARY "fastmath"
+   FUNCTION Fast_Sqrt&(BYVAL val AS LONG)
+END DECLARE
+
+value = Fast_Sqrt&(2000)
+print value;
+SYSTEM

tests/compile_tests/declare_library_header/test-compile-base.output

@@ -0,0 +1 @@
+ 4000 

tests/compile_tests/declare_library_header/test-include.bas

@@ -0,0 +1,7 @@
+$CONSOLE:ONLY
+
+'$include:'../extra/declare-header.bi'
+
+value = Fast_Sqrt&(2000)
+print value;
+SYSTEM

tests/compile_tests/declare_library_header/test-include.output

@@ -0,0 +1 @@
+ 4000 

tests/compile_tests/extra/declare-header.bi

@@ -0,0 +1,5 @@
+
+DECLARE LIBRARY "./header-dir/fastmath-extra"
+   FUNCTION Fast_Sqrt&(BYVAL val AS LONG)
+END DECLARE
+

tests/compile_tests/extra/header-dir/fastmath-extra.h

@@ -0,0 +1,6 @@
+
+// Fake function for testing
+int Fast_Sqrt(int value)
+{
+    return value * 2;
+}