Don't define FRONTEND for ecpg libraries

Not needed anymore after 7143b3e821.

Discussion: https://postgr.es/m/20220820194550.725755r6fj2ro3rx@awork3.anarazel.de

src/interfaces/ecpg/compatlib/Makefile

@@ -19,7 +19,7 @@ SO_MAJOR_VERSION= 3
 SO_MINOR_VERSION= $(MAJORVERSION)
 
 override CPPFLAGS := -I../include -I$(top_srcdir)/src/interfaces/ecpg/include \
-	-I$(libpq_srcdir) -DFRONTEND $(CPPFLAGS)
+	-I$(libpq_srcdir) $(CPPFLAGS)
 override CFLAGS += $(PTHREAD_CFLAGS)
 
 SHLIB_LINK_INTERNAL = -L../ecpglib -lecpg -L../pgtypeslib -lpgtypes $(libpq_pgport_shlib)

src/interfaces/ecpg/ecpglib/Makefile

@@ -19,7 +19,7 @@ SO_MAJOR_VERSION= 6
 SO_MINOR_VERSION= $(MAJORVERSION)
 
 override CPPFLAGS := -I../include -I$(top_srcdir)/src/interfaces/ecpg/include \
-	-I$(libpq_srcdir) -I$(top_builddir)/src/port -DFRONTEND $(CPPFLAGS)
+	-I$(libpq_srcdir) -I$(top_builddir)/src/port $(CPPFLAGS)
 override CFLAGS += $(PTHREAD_CFLAGS)
 
 OBJS = \

src/interfaces/ecpg/pgtypeslib/Makefile

@@ -19,7 +19,7 @@ SO_MAJOR_VERSION= 3
 SO_MINOR_VERSION= $(MAJORVERSION)
 
 override CPPFLAGS := -I../include -I$(top_srcdir)/src/interfaces/ecpg/include \
-	-DFRONTEND $(CPPFLAGS)
+	$(CPPFLAGS)
 override CFLAGS += $(PTHREAD_CFLAGS)
 
 SHLIB_LINK_INTERNAL = -lpgcommon_shlib -lpgport_shlib

src/tools/msvc/Mkvcbuild.pm

@@ -315,14 +315,12 @@ sub mkvcbuild
 	my $pgtypes = $solution->AddProject(
 		'libpgtypes', 'dll',
 		'interfaces', 'src/interfaces/ecpg/pgtypeslib');
-	$pgtypes->AddDefine('FRONTEND');
 	$pgtypes->AddReference($libpgcommon, $libpgport);
 	$pgtypes->UseDef('src/interfaces/ecpg/pgtypeslib/pgtypeslib.def');
 	$pgtypes->AddIncludeDir('src/interfaces/ecpg/include');
 
 	my $libecpg = $solution->AddProject('libecpg', 'dll', 'interfaces',
 		'src/interfaces/ecpg/ecpglib');
-	$libecpg->AddDefine('FRONTEND');
 	$libecpg->AddIncludeDir('src/interfaces/ecpg/include');
 	$libecpg->AddIncludeDir('src/interfaces/libpq');
 	$libecpg->AddIncludeDir('src/port');
@@ -333,7 +331,6 @@ sub mkvcbuild
 	my $libecpgcompat = $solution->AddProject(
 		'libecpg_compat', 'dll',
 		'interfaces',     'src/interfaces/ecpg/compatlib');
-	$libecpgcompat->AddDefine('FRONTEND');
 	$libecpgcompat->AddIncludeDir('src/interfaces/ecpg/include');
 	$libecpgcompat->AddIncludeDir('src/interfaces/libpq');
 	$libecpgcompat->UseDef('src/interfaces/ecpg/compatlib/compatlib.def');