Merge branch 'installers' of https://github.com/rahulp13/nghdl into installers

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+# Changes for Ngspice version upgrade
+
+1. Manually add the GHDL server close patch (header files and “close_server” function at the appropriate location) in the outitf.c which comes with the new Ngspice version
+>Refer to previous version of NGHDL outitf.c file for reference
+
+call this function [ close_server(); ] in outitf.c before the line
+```c
+fprintf(stdout, "\nNo. of Data Rows : %d\n", run->pointCount);
+```
+Which occurs in two functions in outitf.c (may not be same in the future), in functions named
+```c
+    static void fileEnd(runDesc *run)
+```
+and
+```c
+    static void plotEnd(runDesc *run)
+```
+**--- Do not replace old outitf.c with the outitf.c in the new ngspice version.\
+--- Make sure to maintain OS independence of the code, that is same code file for Windows and Linux.** 
+
+2. Similarly manually add patch for identification of Mingw and linking of libws2_32.a to makedefs.in at */ngspice/src/xspice/icm* **after the line `LIBS = -lm`** (important)
+```make
+ISMINGW = $(shell uname | grep -c "MINGW64")
+ifeq ($(ISMINGW), 1)
+  LIBS = -lm -lws2_32
+endif
+ 
+ISMINGW = $(shell uname | grep -c "MINGW32")
+ifeq ($(ISMINGW), 1)
+  LIBS = -lm -lws2_32
+endif
+ 
+ISMINGW = $(shell uname | grep -c "MSYS")
+ifeq ($(ISMINGW), 1)
+  LIBS = -lm -lws2_32
+endif
+```
+
+3. Add patch for linking libws2_32.a in Windows at Makefile.in at */ngspice/src/* by modifying the line
+```make
+@WINGUI_TRUE@am__append_19 = -lpsapi -lShlwapi 
+```
+To
+```make
+@WINGUI_TRUE@am__append_19 = -lpsapi -lShlwapi -lws2_32
+```
+
+
+4. Add patch for addition of GHDL codemodel to the spinit.in file at */ngspice/src/* as an addition to the section
+```make
+* The other codemodels
+```
+with the line
+```make
+@XSPICEINIT@ codemodel @pkglibdir@/ghdl.cm
+```
+and in GNUmakefile.in at */ngspice/src/xspice/icm* by replacing the line
+```make
+CMDIRS = spice2poly digital analog xtradev xtraevt table
+```
+with
+```make
+CMDIRS = spice2poly digital analog xtradev xtraevt table ghdl
+```
+5. Create a **`ghdl folder`** with two empty files named `modpath.lst` and `udnpath.lst` at the location */ngspice/src/xspice/icm/*