Add names to enums

gdb was showing <anonymous enum> instead of useful stuff, so name
all our enums.

src/hb-blob.h

@@ -36,7 +36,7 @@
 HB_BEGIN_DECLS
 
 
-typedef enum {
+typedef enum _hb_memory_mode_t {
   HB_MEMORY_MODE_DUPLICATE,
   HB_MEMORY_MODE_READONLY,
   HB_MEMORY_MODE_WRITABLE,

src/hb-common.h

@@ -99,7 +99,7 @@ hb_tag_t hb_tag_from_string (const char *s, int len);
 
 /* hb_direction_t */
 
-typedef enum {
+typedef enum _hb_direction_t {
   HB_DIRECTION_INVALID = -1,
   HB_DIRECTION_LTR = 0,
   HB_DIRECTION_RTL,
@@ -140,7 +140,7 @@ hb_language_get_default (void);
 
 /* hb_unicode_general_category_t */
 
-typedef enum
+typedef enum _hb_unicode_general_category_t
 {
   HB_UNICODE_GENERAL_CATEGORY_CONTROL,			/* Cc */
   HB_UNICODE_GENERAL_CATEGORY_FORMAT,			/* Cf */
@@ -179,7 +179,7 @@ typedef enum
 
 /* http://unicode.org/iso15924/ */
 /* http://goo.gl/x9ilM */
-typedef enum
+typedef enum _hb_script_t
 {
   /* Unicode-1.1 additions */
   HB_SCRIPT_COMMON			= HB_TAG ('Z','y','y','y'),

src/hb-ot-layout-common-private.hh

@@ -271,7 +271,7 @@ typedef RecordListOf<Feature> FeatureList;
 
 struct LookupFlag : USHORT
 {
-  enum {
+  enum Flags {
     RightToLeft		= 0x0001u,
     IgnoreBaseGlyphs	= 0x0002u,
     IgnoreLigatures	= 0x0004u,

src/hb-ot-layout-gdef-table.hh

@@ -327,7 +327,7 @@ struct GDEF
 {
   static const hb_tag_t Tag	= HB_OT_TAG_GDEF;
 
-  enum {
+  enum GlyphClasses {
     UnclassifiedGlyph	= 0,
     BaseGlyph		= 1,
     LigatureGlyph	= 2,

src/hb-ot-layout-gpos-table.hh

@@ -46,8 +46,7 @@ typedef Value ValueRecord[VAR];
 
 struct ValueFormat : USHORT
 {
-  enum
-  {
+  enum Flags {
     xPlacement	= 0x0001,	/* Includes horizontal adjustment for placement */
     yPlacement	= 0x0002,	/* Includes vertical adjustment for placement */
     xAdvance	= 0x0004,	/* Includes horizontal adjustment for advance */
@@ -1336,7 +1335,7 @@ struct PosLookupSubTable
 {
   friend struct PosLookup;
 
-  enum {
+  enum Type {
     Single		= 1,
     Pair		= 2,
     Cursive		= 3,

src/hb-ot-layout-gsub-table.hh

@@ -678,7 +678,7 @@ struct SubstLookupSubTable
 {
   friend struct SubstLookup;
 
-  enum {
+  enum Type {
     Single		= 1,
     Multiple		= 2,
     Alternate		= 3,

src/hb-ot-layout-private.hh

@@ -44,7 +44,7 @@
 #define props_cache() var1.u16[1] /* glyph_props cache */
 
 /* XXX cleanup */
-typedef enum {
+typedef enum _hb_ot_layout_glyph_class_t {
   HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED	= 0x0001,
   HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH	= 0x0002,
   HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE	= 0x0004,