lang/gprolog: recover GNU Prolog under FreeBSD.

Update to version 1.4.5 released in 2020.
Make it build and run with Clang 10:

- clang has no register reservation for x86, hence patch-EnginePl_machine.h
  and -DNO_MACHINE_REG_FOR_REG_BANK to prevent using missing feature;
- add patch-Ma2Asm_x86__64__any.c fetched from upstream SourceForge
  post-release commit dealing with PIC issues;
- disable usage of spinlocks that results in a hang eating all available
  CPU cycles; fixed with -DUSE_LOCKS=1 -DUSE_RECURSIVE_LOCKS=1
  -DUSE_SPIN_LOCKS=0;
- the software uses bundled dlmalloc dated back 2011 that replaces
  functions like calloc() with own implemenations and it's calloc()
  sometimes fails to clear allocated memory; this results in SIGSEGV
  when its own hash-table implementation dereferences junk that
  supposed to be NULL pointer, so it fails to complete build;
  fixed with MMAP_CLEARS=0.

PR:		231393

1 files changed, 20 insertions, 0 deletions

diff --git a/lang/gprolog/files/patch-EnginePl_machine.h b/lang/gprolog/files/patch-EnginePl_machine.h
new file mode 100644
index 000000000000..69bb186b924b
--- /dev/null
+++ b/lang/gprolog/files/patch-EnginePl_machine.h
@@ -0,0 +1,20 @@
+--- EnginePl/machine.h.orig	2015-01-13 18:00:19 UTC
++++ EnginePl/machine.h
+@@ -124,7 +124,7 @@ void M_Check_Magic_Words(void); /* not c
+ #    define M_USED_REGS            {"$9", "$10", "$11", "$12", "$13", "$14", 0}
+ 
+ /* on M_ix86_darwin : %ebx is used by gcc for pic base */
+-#elif defined(M_ix86) && !defined(_MSC_VER) && !defined(M_ix86_darwin)
++#elif defined(M_ix86) && !defined(_MSC_VER) && !defined(M_ix86_darwin) && !defined(__clang__)
+ 
+ #ifdef NO_USE_EBP
+ #    define M_USED_REGS            {"ebx", 0}
+@@ -137,7 +137,7 @@ void M_Check_Magic_Words(void); /* not c
+ #    define M_USED_REGS            {"15", "20", 0}
+ 
+ /* on M_x86_64_darwin Lion r12-r15 do not work (why ?) */
+-#elif defined(M_x86_64) && !defined(_MSC_VER) && !defined(M_x86_64_darwin)
++#elif defined(M_x86_64) && !defined(_MSC_VER) && !defined(M_x86_64_darwin) && !defined(__clang__)
+ 
+ #    define M_USED_REGS            {"r12", "r13", "r14", "r15", 0}
+