grass_raster: Remove dynamic loading of GDAL libraries (#2290)

Always use standard build-time linking mechanism instead of run-time one. This removes the need to keep adding new versions of libraries for all platforms.  

- Removes GDAL_DYNAMIC.
- Reverts 2650397.
- Fixes #1872.
- Closes #2290.

include/Make/Grass.make

@@ -100,7 +100,6 @@ MANDIR = $(MANBASEDIR)/man$(MANSECT)
 HTML2MAN = VERSION_NUMBER=$(GRASS_VERSION_NUMBER) $(GISBASE)/utils/g.html2man.py
 
 GDAL_LINK = $(USE_GDAL)
-GDAL_DYNAMIC = 1
 
 DEPFILE = depend.mk
 
@@ -235,16 +234,8 @@ DISPLAYDEPS += $(CAIRODRIVERLIB)
 endif
 
 ifneq ($(GDAL_LINK),)
-ifneq ($(GDAL_DYNAMIC),)
-ifneq ($(MINGW),)
-RASTERDEPS += -lkernel32
-else
-RASTERDEPS += $(DLLIB)
-endif
-else
 RASTERDEPS += $(GDALLIBS)
 endif
-endif
 
 ifeq ($(OPENGL_WINDOWS),1)
 NVIZDEPS += -lgdi32

lib/raster/Makefile

@@ -10,11 +10,6 @@ include $(MODULE_TOPDIR)/include/Make/Doxygen.make
 ifneq ($(GDAL_LINK),)
 EXTRA_CFLAGS += -DGDAL_LINK=1
 EXTRA_INC += $(PROJINC) $(GDALCFLAGS)
-
-ifneq ($(GDAL_DYNAMIC),)
-EXTRA_CFLAGS += -DGDAL_DYNAMIC=1
-endif
-
 endif
 
 default: lib